新增 external v1 游戏场景生成路由并迁移 AGC 美术包背景阶段

- api-server 新增 POST /api/external/v1/editor/scenes/generations，复用 editor:image-generate scope、幂等键和站内场景生图队列 - editor_project.rs 抽取站内与外部共用的场景生图 payload 构造函数，站内 handler 改为调用共享函数 - 同步更新 external v1 OpenAPI 契约与 MCP 派生排除标记，登记 docs/README.md 索引 - AGC 客户端美术包背景阶段改走新场景路由，stylePreset 固定 custom + customStyle 保留现有风格文案 - external_generation_state 快照与 recovery_scan 账本白名单支持新场景路由 - direct_runtime 背景资源识别同时兼容新场景路由与旧通用路由，新增旧路由回放测试 - 更新 genarrative-external-editor-api skill 参考文档 - 新增主规范、里程碑规范与实施计划三份 SDD 文档
2026-09-24 15:40:30 +00:00
parent c07c10c0c7
commit 571cb00fe4
14 changed files with 578 additions and 64 deletions
@@ -30,6 +30,7 @@ The hosted MCP offers the following tools. Choose the task tool when its action
 | `PATCH /api/external/v1/editor/assets/{assetId}` | `organize_asset_library` (`update_asset`) | `update_editor_asset` |
 | `DELETE /api/external/v1/editor/assets/{assetId}` | `delete_resources` (`delete_asset`) | `delete_editor_asset` |
 | `POST /api/external/v1/editor/images/generations` | `generate_image`, `modify_image` (`variation`, fixed `kind="quick-edit"`) | `generate_external_editor_image` |
+| `POST /api/external/v1/editor/scenes/generations` | structured game-scene generation (no hosted MCP tool yet) | `generate_external_editor_scene` |
 | `POST /api/external/v1/editor/images/edits` | `modify_image` (`edit`) | `edit_external_editor_image` |
 | `POST /api/external/v1/editor/images/background-removals` | `modify_image` (`remove_background`) | `remove_external_editor_image_background` |
 | `POST /api/external/v1/editor/icon-spritesheets/generations` | `generate_icon_spritesheet` | `generate_external_editor_icon_spritesheet` |
@@ -89,6 +90,7 @@ Every generation row requires a stable `Idempotency-Key` header and returns HTTP
 | Capability          | POST path                                                     | Required body fields                                                                                                                            | Common optional body fields                                                                                                                                            |
 | ------------------- | ------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | Image generation    | `/api/external/v1/editor/images/generations`                  | `prompt`                                                                                                                                        | `kind`, `style`, `model`, `aspectRatio`, `imageSize`, `size`, `referenceImageSrcs`, `projectId`, `assetFolderId`, `assetLabel`, `canvasCompletion`, `generationInputs` |
+| Game scene          | `/api/external/v1/editor/scenes/generations`                  | `sceneContent`, `stylePreset`                                                                                                                   | `customStyle` (required when `stylePreset="custom"`), `model`, `aspectRatio`, `imageSize`, `referenceImageSrcs`, `projectId`, `assetFolderId`, `assetLabel`, `canvasCompletion`, `generationInputs` |
 | Image edit/redraw   | `/api/external/v1/editor/images/edits`                        | `prompt`, `sourceReferenceId`                                                                                                                   | `referenceImageSrcs`, `model`, `size`, `projectId`, `assetFolderId`, `assetLabel`, `targetLayerId`, `canvasCompletion`                                                 |
 | Background removal  | `/api/external/v1/editor/images/background-removals`          | `sourceImageSrc`                                                                                                                                | `projectId`, `sourceResourceId`, `targetLayerId`, static-image `assetKind`, `assetFolderId`, `assetLabel`, `canvasCompletion`, `generationInputs`                      |
 | Icon spritesheet    | `/api/external/v1/editor/icon-spritesheets/generations`       | `referenceId`, `iconDescriptions`, `sliceMode`                                                                                                  | `gridX`, `gridY`, `sliceCount`, `style`, `referenceImageSrcs`, `screenColor`, `model`, `aspectRatio`, `imageSize`, `projectId`, `assetFolderId`, `assetLabel`, `canvasCompletion`       |
@@ -98,7 +100,7 @@ Every generation row requires a stable `Idempotency-Key` header and returns HTTP
 | Sound effect        | `/api/external/v1/editor/audios/sound-effects/generations`    | `prompt`                                                                                                                                        | `model`, `duration`, `loop`, `projectId`, `assetFolderId`, `assetLabel`, `canvasCompletion`, `generationInputs`                                                        |
 | Background music    | `/api/external/v1/editor/audios/background-music/generations` | `gptDescriptionPrompt`, `makeInstrumental`                                                                                                      | `projectId`, `assetFolderId`, `assetLabel`, `canvasCompletion`, `generationInputs`                                                                                     |

-Poll all nine through:
+Poll all ten through:

 ```text
 GET /api/external/v1/generations/{operationId}
@@ -140,7 +142,7 @@ The icon-spritesheet primary `referenceId` is intentionally stricter than ordina
 Use OpenAPI as the final authority; these common values are a routing aid:

 - Image `kind`: `spec`, `character`, `quick-edit`, `ui-design`, `publication-material`; ordinary image generation may omit it.
- External v1 currently has no structured game-scene generation operation. Do not send `kind: "scene"` or `assetKind: "scene"` through generic image generation; the server rejects both before queueing.
+- Game scenes must use the dedicated structured route `POST /api/external/v1/editor/scenes/generations` (`sceneContent` + `stylePreset`; `customStyle` required for `custom`). Do not send `kind: "scene"` or `assetKind: "scene"` through generic image generation; the server rejects both before queueing. The scene route assembles the full provider prompt server-side and never accepts a caller-assembled `prompt`.
 - Image `model`: `gpt-image-2`, `gemini-3.1-flash-image-preview`, `nanobanana2`, `nano-banana`.
 - Image `aspectRatio`: `1:1`, `2:3`, `3:2`, `9:16`, `16:9`.
 - Image `imageSize`: `0.5K`, `1K`, `2K`.
@@ -148,7 +148,7 @@ For the lower-level asset/resource creation endpoints, `generationInputs` is rep

 ## Art Spec and Image Request

-Generic External v1 image generation does not expose the main-site structured game-scene contract. `kind: "scene"` and `assetKind: "scene"` are both invalid and return HTTP `400` before any generation job is queued. Do not replace the structured scene fields and server-owned prompt assembly with a generic image prompt.
+Game scenes have a dedicated structured route: `POST /api/external/v1/editor/scenes/generations` with `sceneContent` and `stylePreset` (`customStyle` required when `stylePreset` is `custom`). The server assembles the full provider prompt; a caller-assembled `prompt` is not accepted. `kind: "scene"` and `assetKind: "scene"` remain invalid on generic image generation and return HTTP `400` before any generation job is queued.

 When maintaining a reusable art spec, carry it in `generationInputs.artSpec` and reflect important constraints in the prompt. This is an example with both canvas and library destinations, not a requirement for every generation:

@@ -2626,6 +2626,30 @@ fn direct_taonier_reference_matches_local_source(
    .unwrap_or(false)
 }

+fn direct_taonier_background_asset_identity(
+    root: &Path,
+    expected_reference_source: Option<&DirectTaonierArtAssetIdentity>,
+) -> Option<DirectTaonierArtAssetIdentity> {
+    direct_taonier_art_asset_identity(
+        root,
+        DIRECT_CODEX_BACKGROUND_ASSET_PATH,
+        GameCreationAppAssetKind::Scene,
+        "/api/external/v1/editor/scenes/generations",
+        "scene",
+        expected_reference_source,
+    )
+    .or_else(|| {
+        direct_taonier_art_asset_identity(
+            root,
+            DIRECT_CODEX_BACKGROUND_ASSET_PATH,
+            GameCreationAppAssetKind::Scene,
+            "/api/external/v1/editor/images/generations",
+            "spec",
+            expected_reference_source,
+        )
+    })
+}
+
 fn direct_taonier_art_base_is_valid(root: &Path) -> bool {
    let Some(art_spec) = direct_taonier_art_asset_identity(
        root,
@@ -2637,14 +2661,7 @@ fn direct_taonier_art_base_is_valid(root: &Path) -> bool {
    ) else {
        return false;
    };
-    let Some(background) = direct_taonier_art_asset_identity(
-        root,
-        DIRECT_CODEX_BACKGROUND_ASSET_PATH,
-        GameCreationAppAssetKind::Scene,
-        "/api/external/v1/editor/images/generations",
-        "spec",
-        Some(&art_spec),
-    ) else {
+    let Some(background) = direct_taonier_background_asset_identity(root, Some(&art_spec)) else {
        return false;
    };
    let _ = (background, art_spec);
@@ -3625,15 +3642,7 @@ pub(crate) async fn ensure_direct_taonier_art_package_at(
        })
        .flatten();
    let existing_art_spec_and_background = existing_art_spec.as_ref().is_some_and(|art_spec| {
-        direct_taonier_art_asset_identity(
-            root,
-            DIRECT_CODEX_BACKGROUND_ASSET_PATH,
-            GameCreationAppAssetKind::Scene,
-            "/api/external/v1/editor/images/generations",
-            "spec",
-            Some(art_spec),
-        )
-        .is_some()
+        direct_taonier_background_asset_identity(root, Some(art_spec)).is_some()
    });
    let art_spec = match existing_art_spec {
        Some(identity) => identity,
@@ -3709,15 +3718,7 @@ pub(crate) async fn ensure_direct_taonier_art_package_at(
        }
    };
    if mode.regenerates_existing()
-        || direct_taonier_art_asset_identity(
-            root,
-            DIRECT_CODEX_BACKGROUND_ASSET_PATH,
-            GameCreationAppAssetKind::Scene,
-            "/api/external/v1/editor/images/generations",
-            "spec",
-            Some(&art_spec),
-        )
-        .is_none()
+        || direct_taonier_background_asset_identity(root, Some(&art_spec)).is_none()
    {
        emit_direct_game_creator_progress(root, "art.background", "正在生成 16:9 游戏场景背景图");
        let outcome = match generate_direct_taonier_art_asset_at(
@@ -8421,8 +8422,8 @@ mod tests {
                vec!["taonier-resource-icon-spec".to_string()],
            ),
            GameCreationAppAssetKind::Scene => (
-                "/api/external/v1/editor/images/generations",
-                "spec",
+                "/api/external/v1/editor/scenes/generations",
+                "scene",
                vec!["taonier-resource-icon-spec".to_string()],
            ),
            _ => (
@@ -8806,6 +8807,46 @@ mod tests {
        );
    }

+    #[test]
+    fn legacy_route_background_registration_still_counts_as_valid_base() {
+        let root = tempfile::tempdir().expect("temp dir");
+        init_local_game_project_at(root.path(), "legacy-background-route", "旧路由背景登记")
+            .expect("init project");
+        std::fs::create_dir_all(root.path().join("assets")).expect("assets dir");
+        register_direct_taonier_art_asset_fixture(
+            root.path(),
+            DIRECT_CODEX_ART_SPEC_ASSET_PATH,
+            GameCreationAppAssetKind::IconSpec,
+        );
+        std::fs::write(
+            root.path().join(DIRECT_CODEX_BACKGROUND_ASSET_PATH),
+            tiny_visible_png(),
+        )
+        .expect("background bytes");
+        register_local_asset_at(
+            root.path(),
+            DIRECT_CODEX_BACKGROUND_ASSET_PATH,
+            GameCreationAppAssetKind::Scene,
+            "image/png",
+            "platform-art",
+            GameCreationAppAssetSource {
+                kind: GameCreationAppAssetSourceKind::Canvas,
+                canvas_project_id: Some("taonier-project".to_string()),
+                resource_id: Some("taonier-resource-game-background".to_string()),
+                asset_object_id: Some("taonier-object-game-background".to_string()),
+                task_id: Some("taonier-task-game-background".to_string()),
+                prompt: None,
+                model: Some("gpt-image-2".to_string()),
+                generation_route: Some("/api/external/v1/editor/images/generations".to_string()),
+                generation_kind: Some("spec".to_string()),
+                reference_resource_ids: vec!["taonier-resource-icon-spec".to_string()],
+            },
+        )
+        .expect("register legacy-route background");
+
+        assert!(direct_taonier_art_base_is_valid(root.path()));
+    }
+
    fn tiny_visible_png() -> Vec<u8> {
        let mut bytes = Vec::new();
        let image = image::DynamicImage::ImageRgba8(image::RgbaImage::from_pixel(
@@ -2835,14 +2835,15 @@ pub(in crate::agent) fn retained_platform_art_generation_runtime_state_matches_d
                && art_spec_asset_type == Some("icon-spec")
        }
        GameCreationAppAssetKind::Scene => {
-            snapshot.endpoint == "/api/external/v1/editor/images/generations"
-                && snapshot.generation_kind == "spec"
+            snapshot.endpoint == "/api/external/v1/editor/scenes/generations"
+                && snapshot.generation_kind == "scene"
                && platform_art_runtime_references_match_request_contract(
                    &snapshot.reference_resource_ids,
                    GameCreationAppAssetKind::Scene,
                )
-                && request_asset_kind.as_deref() == Some("game-background")
-                && art_spec_asset_type == Some("background")
+                && json_string_field(&request_body, "sceneContent")
+                    .is_some_and(|value| !value.trim().is_empty())
+                && json_string_field(&request_body, "stylePreset").as_deref() == Some("custom")
        }
        GameCreationAppAssetKind::IconSpritesheet => {
            snapshot.endpoint == "/api/external/v1/editor/icon-spritesheets/generations"
@@ -3248,6 +3249,7 @@ pub(in crate::agent) async fn request_platform_art_asset_with_runtime_options_at
            GameCreationAppAssetKind::Image => "image",
            GameCreationAppAssetKind::Character => "character",
            GameCreationAppAssetKind::PublicationMaterial => "publication-material",
+            GameCreationAppAssetKind::Scene => "scene",
            _ => "spec",
        };
        let is_canonical_art_spritesheet =
@@ -3291,6 +3293,25 @@ pub(in crate::agent) async fn request_platform_art_asset_with_runtime_options_at
                    },
                }),
            )
+        } else if options.asset_kind == GameCreationAppAssetKind::Scene {
+            (
+                "/api/external/v1/editor/scenes/generations",
+                serde_json::json!({
+                    "sceneContent": generation_prompt,
+                    "stylePreset": "custom",
+                    "customStyle": prompt_text!("media.scene_style"),
+                    "aspectRatio": options.aspect_ratio,
+                    "imageSize": options.image_size,
+                    "assetLabel": options.asset_label,
+                    "projectId": canvas_context.project_id,
+                    "assetFolderId": canvas_context.asset_folder_id,
+                    "referenceImageSrcs": references.ordered.clone(),
+                    "canvasCompletion": {
+                        "title": options.asset_label,
+                        "placeholder": external_canvas_placeholder(&options.aspect_ratio),
+                    },
+                }),
+            )
        } else {
            (
                "/api/external/v1/editor/images/generations",
@@ -13272,14 +13293,13 @@ mod canvas_generation_tests {
        let background = write_retained_stage(
            root,
            "run-background-canonical-and-user-references",
-            "/api/external/v1/editor/images/generations",
+            "/api/external/v1/editor/scenes/generations",
            serde_json::json!({
-                "prompt": "保留账本参考合同",
-                "kind": "spec",
-                "assetKind": "game-background",
+                "sceneContent": "保留账本参考合同",
+                "stylePreset": "custom",
+                "customStyle": "原创横屏 Web 游戏场景背景",
                "projectId": "test-canvas-project",
                "assetFolderId": "test-asset-folder",
-                "generationInputs": { "artSpec": { "assetType": "background" } },
                "referenceImageSrcs": ["resource-icon-spec", "user-reference-1"],
            }),
        );
@@ -735,6 +735,30 @@ pub(super) fn platform_art_generation_runtime_request_snapshot(
                .collect::<Result<Vec<_>, _>>()?;
            (generation_kind, reference_resource_ids)
        }
+        "/api/external/v1/editor/scenes/generations" => {
+            if json_string_field(&request_body, "sceneContent")
+                .is_none_or(|value| value.trim().is_empty())
+            {
+                return Err("External Editor 场景生成账本请求缺少 sceneContent".to_string());
+            }
+            let reference_resource_ids = request_body
+                .get("referenceImageSrcs")
+                .and_then(serde_json::Value::as_array)
+                .ok_or_else(|| {
+                    "External Editor 场景生成账本请求缺少 referenceImageSrcs".to_string()
+                })?
+                .iter()
+                .map(|value| {
+                    value
+                        .as_str()
+                        .map(str::trim)
+                        .filter(|value| !value.is_empty())
+                        .map(str::to_string)
+                        .ok_or_else(|| "External Editor 场景生成账本引用资源 ID 无效".to_string())
+                })
+                .collect::<Result<Vec<_>, _>>()?;
+            ("scene".to_string(), reference_resource_ids)
+        }
        "/api/external/v1/editor/icon-spritesheets/generations" => {
            let reference_resource_id = json_string_field(&request_body, "referenceId")
                .or_else(|| json_string_field(&request_body, "referenceImageSrc"))
@@ -555,6 +555,7 @@ fn platform_art_generation_request_snapshot_is_valid(payload: &serde_json::Value
        endpoint,
        Some(
            "/api/external/v1/editor/images/generations"
+                | "/api/external/v1/editor/scenes/generations"
                | "/api/external/v1/editor/icon-spritesheets/generations"
        )
    );
@@ -23,6 +23,7 @@
 - [外部 OpenAPI 与 API Key 接入方案](./【后端架构】外部OpenAPI与APIKey接入方案-2026-06-19.md)
 - [外部 MCP 语义工具说明与参数设计](./technical/【技术方案】外部MCP语义工具说明与参数设计-2026-09-23.md)：15 个新增语义工具与全部原工具并存，复用现有 External API；包含工具说明、action、参数、幂等和兼容合同。
 - [External v1 OpenAPI](./openapi/genarrative-external-v1.openapi.json)：公开 HTTP 契约唯一机器可读来源。
+- [External v1 游戏场景生成路由](./technical/【技术方案】ExternalV1游戏场景生成路由-2026-09-24.md)：external v1 结构化场景生成专用路由与 AGC 美术包背景阶段迁移合同。

 ## AI 游戏创作与 Agent Runtime

@@ -1052,7 +1052,60 @@
            "$ref": "#/components/responses/UpstreamError"
          }
        },
-        "description": "支持普通生图、规范图、角色图、快速编辑参考图、UI 设计图和宣发素材生成。kind 可取 spec、character、quick-edit、ui-design、publication-material。"
+        "description": "支持普通生图、规范图、角色图、快速编辑参考图、UI 设计图和宣发素材生成。kind 可取 spec、character、quick-edit、ui-design、publication-material。游戏场景不接受本接口的 kind/assetKind = scene，必须使用 /api/external/v1/editor/scenes/generations 提交结构化场景意图。"
+      }
+    },
+    "/api/external/v1/editor/scenes/generations": {
+      "post": {
+        "x-mcp-excluded": true,
+        "tags": ["Editor Images"],
+        "operationId": "generateExternalEditorScene",
+        "summary": "生成编辑器游戏场景（结构化场景意图）",
+        "description": "只接受结构化场景意图：sceneContent + stylePreset（custom 时必须提供 customStyle），完整 Provider Prompt 由服务端组装，不接受调用方提交的完整 prompt。入队后按 kind/assetKind = scene 持久化，产物保存 scene.generate V2 配方；队列、计费、资源入库与画布写回与站内场景路由一致。",
+        "security": [
+          {
+            "ExternalApiKey": []
+          }
+        ],
+        "parameters": [
+          {
+            "$ref": "#/components/parameters/IdempotencyKey"
+          }
+        ],
+        "requestBody": {
+          "required": true,
+          "content": {
+            "application/json": {
+              "schema": {
+                "$ref": "#/components/schemas/EditorSceneGenerationRequest"
+              }
+            }
+          }
+        },
+        "responses": {
+          "202": {
+            "description": "生成任务已持久化入队",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ExternalEditorGenerationSubmissionResponse"
+                }
+              }
+            }
+          },
+          "400": {
+            "$ref": "#/components/responses/BadRequest"
+          },
+          "401": {
+            "$ref": "#/components/responses/Unauthorized"
+          },
+          "403": {
+            "$ref": "#/components/responses/Forbidden"
+          },
+          "502": {
+            "$ref": "#/components/responses/UpstreamError"
+          }
+        }
      }
    },
    "/api/external/v1/editor/images/edits": {
@@ -2965,6 +3018,68 @@
          }
        }
      },
+      "EditorSceneGenerationRequest": {
+        "type": "object",
+        "required": ["sceneContent", "stylePreset"],
+        "properties": {
+          "sceneContent": {
+            "type": "string",
+            "minLength": 1,
+            "description": "画面内容（结构化场景意图主体）。纯空白在入队前返回 400。"
+          },
+          "stylePreset": {
+            "type": "string",
+            "enum": ["anime", "watercolor", "flat", "stop-motion", "custom"],
+            "description": "视觉风格预设。custom 时必须同时提供非空 customStyle，否则返回 400。"
+          },
+          "customStyle": {
+            "type": ["string", "null"],
+            "description": "自定义画风描述，仅 stylePreset = custom 时使用。"
+          },
+          "model": {
+            "type": ["string", "null"],
+            "description": "图片模型，省略时使用服务端默认场景模型。"
+          },
+          "aspectRatio": {
+            "type": ["string", "null"],
+            "default": "16:9"
+          },
+          "imageSize": {
+            "type": ["string", "null"],
+            "default": "1K"
+          },
+          "referenceImageSrcs": {
+            "type": "array",
+            "items": {
+              "type": "string"
+            },
+            "description": "可选参考图，沿用普通图片生成的参考图口径。"
+          },
+          "projectId": {
+            "type": ["string", "null"]
+          },
+          "generationInputs": {
+            "$ref": "#/components/schemas/JsonValue"
+          },
+          "assetFolderId": {
+            "type": ["string", "null"]
+          },
+          "assetLabel": {
+            "type": ["string", "null"],
+            "description": "省略或纯空白时统一使用「游戏场景」。"
+          },
+          "canvasCompletion": {
+            "anyOf": [
+              {
+                "$ref": "#/components/schemas/EditorCanvasGenerationCompletion"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          }
+        }
+      },
      "EditorImageGenerationRequest": {
        "type": "object",
        "required": ["prompt"],
@@ -0,0 +1,42 @@
+# 【实施计划】External v1 游戏场景生成路由
+
+| 字段 | 值 |
+| --- | --- |
+| Milestone | `docs/project-memory/plans/【里程碑】ExternalV1游戏场景生成路由-2026-09-24.md` |
+| Status | ready |
+| Owner | Agent |
+
+## 修改边界
+
+- 允许修改：
+  - `server-rs/crates/api-server/src/editor_project.rs`（抽取场景组装/入队共享逻辑）
+  - `server-rs/crates/api-server/src/external_editor_api.rs`（新 handler）
+  - `server-rs/crates/api-server/src/modules/external_api.rs`（路由表与契约矩阵）
+  - `docs/openapi/genarrative-external-v1.openapi.json` 与对应契约测试
+  - AGC `src-tauri/src/agent/generation/canvas_generation.rs`、`src/agent/direct_runtime/mod.rs`、`src/agent/generation/external_generation_state.rs`、`src/agent/runtime_driver/recovery_scan.rs`、`src/project/manifest.rs`（背景阶段路由与身份口径）
+  - `.codex/skills/genarrative-external-editor-api/references/`（外部 API 说明）
+- 明确不修改：站内场景路由行为、通用图片入口校验、SpacetimeDB schema、计费、动画/抠图链路（issue #495）。
+
+## 实现顺序
+
+1. 后端：把 `generate_editor_scene` 的「payload → `EditorImageGenerationRequest`」段抽成 `pub(crate)` 共享函数（含 options 标准化、Prompt 组装、generationInputs 重建、assetLabel 规范化），站内 handler 改为调用它。
+2. 后端：`external_editor_api.rs` 新增 `generate_external_editor_scene`：`require_scope(SCOPE_EDITOR_IMAGE_GENERATE)` + `require_idempotency_key` + 共享函数 + `enqueue_editor_image_generation_for_owner` + `external_generation_accepted_response`。
+3. 后端：`modules/external_api.rs` 路由表与 `PROTECTED_ROUTES` 各加 `/api/external/v1/editor/scenes/generations`（POST）。
+4. 后端：补单测/契约测试（鉴权、参数 400、幂等重放、与站内同 Prompt）；同步 OpenAPI JSON 与契约测试。
+5. 客户端：`canvas_generation.rs` 请求构造为 Scene 拆专属分支——新路由 + `EditorSceneGenerateRequest` 形状 body（`sceneContent` = 现有场景 prompt 文本，`stylePreset = "custom"`，`customStyle` = 现有风格描述文案，其余字段沿用）；修 Scene 保留账本匹配器（新路由 + `sceneContent` 口径），统一 `game-background`/`scene` 不一致。
+6. 客户端：身份/对账常量迁移——`direct_runtime/mod.rs` 背景身份三元组路由与 kind、`manifest.rs` 期望路由、`recovery_scan.rs`、`external_generation_state.rs`；保持旧路由登记可读。
+7. 文档：外部 API Skill references 补新路由；运行编码与 diff 检查。
+
+## 验证命令
+
+1. `cargo test -p api-server`（重点：external_editor_api、editor_project 场景相关）
+2. `cargo test -p shared-contracts`
+3. AGC：`cargo test` 于 `apps/ai-game-creator-shell/src-tauri`（定向：canvas_generation、direct_runtime、recovery_scan、manifest）
+4. `npm run check:encoding`、`git diff --check`、`npm run check:doc-index`
+5. smoke：`npm run dev:api-server` 后 `curl /healthz`，再用测试 Key POST 新路由验证受理与重放。
+
+## 风险与回滚点
+
+- 共享逻辑抽取改变站内路由行为：以「相同输入 Prompt 逐字一致」单测为门禁；回滚点为抽取提交本身。
+- 旧路由登记的身份记录在新常量下读不到：保留旧路由 + `spec` 的读取分支，仅新增写入走新路由；回滚点为常量迁移提交。
+- 幂等重放依赖现有外部生成重放链路（issue #495 问题一不涉及图片生成入口，实测正常）；若 smoke 暴露重放异常，停止合并并记录。
@@ -0,0 +1,45 @@
+# 【里程碑】External v1 游戏场景生成路由
+
+| 字段 | 值 |
+| --- | --- |
+| Version | 1.0 |
+| Status | proposed |
+| Date | 2026-09-24 |
+| Parent Spec | `docs/technical/【技术方案】ExternalV1游戏场景生成路由-2026-09-24.md` |
+
+## 背景与触发
+
+平台自 `72f268e08`（游戏场景需求 v1.0）起在通用图片生成入口拒绝 `kind = scene` / `assetKind = scene`，要求场景必须走结构化专用路由；但 external v1 没有场景路由，AGC 客户端陶泥儿美术包的背景阶段仍向 `/api/external/v1/editor/images/generations` 提交 `assetKind = scene`，被平台参数校验拒绝（HTTP 400），新项目美术包无法生成（实测产物 `gameagent-f91a64dd`）。同时发现背景阶段保留账本匹配器期望 `assetKind = "game-background"`，与实际请求线上的 `"scene"` 不一致，中断恢复匹配失效。
+
+## 目标
+
+1. external v1 新增 `POST /api/external/v1/editor/scenes/generations`，与站内场景路由共享同一场景 Prompt 组装与入队实现，鉴权、幂等、计费、持久化语义与现役外部生成入口一致。
+2. AGC 美术包背景阶段迁移到新路由，以结构化场景意图提交，`reuse-or-create` 与 `regenerate` 均恢复可用，出图风格与尺寸不变。
+3. 背景阶段的路由、manifest 身份登记、保留账本匹配与恢复扫描常量整圈对齐到新路由与实际线上值；历史登记保持可读。
+
+## 不在本里程碑内
+
+- 不改站内场景路由行为与通用图片入口的 scene 拒绝校验。
+- 不改 SpacetimeDB schema、队列类型、计费档位。
+- 不迁移历史背景登记数据。
+- 不处理 issue #495 的两个既有问题。
+
+## 依赖与前置条件
+
+- `shared-contracts`：`EditorSceneGenerateRequest` 已存在，直接复用。
+- `api-server`：站内 `generate_editor_scene` 的组装与入队逻辑抽取为共享实现。
+- AGC `src-tauri`：背景阶段请求构造、保留账本与身份常量迁移。
+
+## 验收标准
+
+- [ ] 新路由契约测试通过：路由矩阵与鉴权、参数 400、同键重放返回原任务、同键不同请求 409。
+- [ ] 外部场景路由与站内路由对相同输入产出相同的后端 Prompt 与入队 payload（共享实现单测对照）。
+- [ ] `docs/openapi/genarrative-external-v1.openapi.json` 与实现一致，相关契约检查通过。
+- [ ] 客户端定向测试：背景阶段请求命中新路由且为结构化字段；保留账本匹配器与实际请求口径一致；`reuse-or-create` 与 `regenerate` 路径回归通过。
+- [ ] 本地真实栈 smoke：`npm run dev:api-server` + 测试 Key 下美术包背景阶段受理成功（Provider 出图按环境可用性记录为已验证或未验证）。
+
+## 证据要求
+
+- 自动化：`cargo test -p api-server`（契约与场景相关单测）、AGC `src-tauri` 定向测试、`npm run check:encoding`、`git diff --check`。
+- 运行时：本地 api-server 受理 smoke。
+- 边界：鉴权 401/403、幂等重放、参数失败关闭。
@@ -0,0 +1,75 @@
+# 【技术方案】External v1 游戏场景生成路由
+
+更新时间：`2026-09-24`
+
+## 目标
+
+为 `/api/external/v1` 补齐游戏场景生成的结构化专用路由，使 AGC 客户端（陶泥儿美术包背景阶段）在平台收紧 `kind = scene` / `assetKind = scene` 边界校验后仍有合规的场景生成入口：
+
+```text
+AGC 美术包背景阶段（结构化场景意图）
+-> POST /api/external/v1/editor/scenes/generations
+-> 后端确定性组装场景 Prompt（与站内场景路由同一实现）
+-> 现有 editor_image_generation 队列与 Worker
+-> 现有计费、幂等、失败、资源持久化与 canvasCompletion
+```
+
+同时修复 AGC 客户端背景阶段保留账本匹配口径与实际请求不一致的既有隐患。
+
+## 非目标
+
+- 不改动站内 `/api/editor/scenes/generations` 的请求字段、Prompt 组装结果与计费语义。
+- 不放松通用 `/api/editor/images/generations` 与 `/api/external/v1/editor/images/generations` 对 `kind = scene` / `assetKind = scene` 的拒绝。
+- 不新增场景 Worker、任务表、计费档位或 SpacetimeDB schema。
+- 不改变美术包背景图的出图风格与尺寸（16:9 / 1K）。
+- 不处理 issue #495 的抠图重放 409 与动画 compact 字段问题（独立排期）。
+
+## 入口与边界
+
+- 系统入口：AGC 客户端 Direct 美术包流程的背景阶段（`reuse-or-create` 与 `regenerate` 均经过）。
+- 涉及模块：`api-server`（external v1 路由与场景 Prompt 组装）、`shared-contracts`（DTO 复用）、AGC `src-tauri`（请求构造、保留账本、身份对账与恢复扫描常量）。
+- 正式状态来源：`external_generation_job` 队列记录与项目 manifest 登记，与现役外部生成入口一致。
+
+## 必须成立的行为
+
+### 正常路径
+
+1. 新路由 `POST /api/external/v1/editor/scenes/generations` 接受与站内场景路由相同的 `EditorSceneGenerateRequest` 字段（`sceneContent`、`stylePreset`、`customStyle?`、`model?`、`aspectRatio?`、`imageSize?`、`referenceImageSrcs?`、`projectId?`、`generationInputs?`、`assetFolderId?`、`assetLabel?`、`canvasCompletion?`），不接受调用方组装后的完整 `prompt`。
+2. 场景 Prompt 由后端经与站内路由完全相同的组装实现生成；两路由只共享这一份组装逻辑。
+3. 鉴权复用现有 `editor:image-generate` scope；与现役外部生成入口一样强制 `Idempotency-Key` 请求头。
+4. 受理响应与现役外部生成入口同形（operationId 异步受理信封），轮询继续走 `/api/external/v1/generations/{operation_id}`。
+5. 入队后 `kind = scene`、`assetKind = scene`，队列类型、Worker、计费与持久化与站内场景路由一致；队列标题与任务摘要口径不变。
+6. AGC 美术包背景阶段以 `stylePreset = custom` + `customStyle` 承载现有风格描述，`sceneContent` 承载 brief 衍生的画面内容，出图风格与比例不因迁移改变。
+
+### 失败、重试与幂等
+
+1. 缺少 `sceneContent`、非法 `stylePreset`、自定义风格缺少 `customStyle` 等参数错误返回 400，与站内路由同语义。
+2. 缺少或非法幂等键、越权 scope 的拒绝语义与现役外部生成入口一致。
+3. 同一幂等键 + 同一请求重放返回原任务，不新建任务、不重复扣费；同键不同请求返回 409。
+4. Provider 失败、取消与 lease 耗尽沿用现有扣退费语义。
+
+### 权限、归属与数据边界
+
+1. 资源归属、项目绑定与素材文件夹解析沿用现役外部生成入口的 owner 口径。
+2. 任务摘要只展示 `generationInputs.fields` 的「画面内容」，不把后端完整 Prompt 暴露到任务侧栏。
+3. 场景产物以 `assetKind = scene` 持久化并保存 `scene.generate` V2 配方，与站内产物口径一致。
+
+## 契约与迁移
+
+- API / DTO / OpenAPI：新增 external v1 场景路由，DTO 复用 `shared-contracts` 的 `EditorSceneGenerateRequest`；同一次变更同步 `docs/openapi/genarrative-external-v1.openapi.json` 与契约测试（路由矩阵、鉴权、参数 400、幂等重放）。
+- SpacetimeDB schema / migration / bindings：不变。
+- 兼容与迁移策略：AGC 客户端背景阶段的路由、manifest 身份登记、保留账本匹配与恢复扫描常量整圈迁移到新路由；历史已登记的背景身份（旧通用路由 + `kind = spec`）保持可读，不做数据迁移。
+
+## 验收标准与证据
+
+| 条款 | 验收方式 | 证据 |
+| ---- | -------- | ---- |
+| 新路由受理/参数校验/鉴权/幂等重放 | api-server 契约测试与单测 | 待补 |
+| 与站内路由同一 Prompt 组装结果 | 共享实现的单测对照 | 待补 |
+| OpenAPI 与实现一致 | 契约测试 + `check:openapi` 类门禁 | 待补 |
+| 美术包背景端到端（reuse-or-create / regenerate） | 客户端定向测试 + 本地真实栈 smoke | 待补 |
+| 中断恢复：保留账本匹配与身份对账 | 客户端定向测试 | 待补 |
+
+## 未决问题与决策
+
+- `stylePreset` 取舍：已决策——AGC 美术包背景固定 `custom` + `customStyle` 承载现有风格文案，不绑定预设风格（2026-09-24，与用户确认）。
@@ -2692,13 +2692,9 @@ fn normalize_editor_scene_asset_label(asset_label: Option<String>) -> String {
    resolve_editor_generated_asset_label(asset_label, "游戏场景")
 }

-pub async fn generate_editor_scene(
-    State(state): State<AppState>,
-    Extension(request_context): Extension<RequestContext>,
-    Extension(authenticated): Extension<AuthenticatedAccessToken>,
-    payload: Result<Json<EditorSceneGenerateRequest>, JsonRejection>,
-) -> Result<Json<Value>, AppError> {
-    let Json(payload) = parse_editor_generation_json_payload(payload)?;
+pub(crate) fn build_editor_scene_image_generation_payload(
+    payload: EditorSceneGenerateRequest,
+) -> Result<EditorImageGenerationRequest, AppError> {
    let generation_options = normalize_editor_scene_generation_options(
        payload.model.as_deref(),
        payload.aspect_ratio.as_deref(),
@@ -2717,8 +2713,7 @@ pub async fn generate_editor_scene(
        }))
    })?;
    let generation_inputs = build_editor_scene_generation_inputs(&payload, &generation_options);
-    let caller = EditorGenerationCaller::from_authenticated(&authenticated);
-    let image_payload = EditorImageGenerationRequest {
+    Ok(EditorImageGenerationRequest {
        prompt,
        size: None,
        kind: Some("scene".to_string()),
@@ -2737,7 +2732,18 @@ pub async fn generate_editor_scene(
        asset_label: Some(normalize_editor_scene_asset_label(payload.asset_label)),
        source_resource_id: None,
        canvas_completion: payload.canvas_completion,
-    };
+    })
+}
+
+pub async fn generate_editor_scene(
+    State(state): State<AppState>,
+    Extension(request_context): Extension<RequestContext>,
+    Extension(authenticated): Extension<AuthenticatedAccessToken>,
+    payload: Result<Json<EditorSceneGenerateRequest>, JsonRejection>,
+) -> Result<Json<Value>, AppError> {
+    let Json(payload) = parse_editor_generation_json_payload(payload)?;
+    let image_payload = build_editor_scene_image_generation_payload(payload)?;
+    let caller = EditorGenerationCaller::from_authenticated(&authenticated);
    if !state.config.external_generation_mode.is_inline() {
        let queue_job = enqueue_editor_image_generation_for_owner(
            &state,
@@ -13269,6 +13275,47 @@ mod tests {
        thread,
    };

+    #[test]
+    fn scene_image_generation_payload_uses_shared_scene_contract() {
+        let payload = build_editor_scene_image_generation_payload(EditorSceneGenerateRequest {
+            scene_content: "雨夜小镇的街道".to_string(),
+            style_preset: "custom".to_string(),
+            custom_style: Some("像素水彩混合".to_string()),
+            model: None,
+            aspect_ratio: None,
+            image_size: None,
+            reference_image_srcs: vec!["resource-ref-1".to_string()],
+            project_id: Some("project-1".to_string()),
+            generation_inputs: None,
+            asset_folder_id: Some("folder-1".to_string()),
+            asset_label: Some("  ".to_string()),
+            canvas_completion: None,
+        })
+        .expect("合法场景意图必须组装成功");
+
+        assert_eq!(payload.kind.as_deref(), Some("scene"));
+        assert_eq!(payload.asset_kind.as_deref(), Some("scene"));
+        assert_eq!(payload.aspect_ratio.as_deref(), Some("16:9"));
+        assert_eq!(payload.image_size.as_deref(), Some("1K"));
+        assert_eq!(payload.asset_label.as_deref(), Some("游戏场景"));
+        assert_eq!(
+            payload.reference_image_srcs.as_deref(),
+            Some(["resource-ref-1".to_string()].as_slice())
+        );
+        assert!(payload.prompt.contains("雨夜小镇的街道"));
+        assert!(payload.prompt.contains("像素水彩混合"));
+        let generation_inputs = payload
+            .generation_inputs
+            .as_ref()
+            .expect("场景 generationInputs 必须存在");
+        assert_eq!(generation_inputs["version"], json!(2));
+        assert_eq!(generation_inputs["action"], json!("scene.generate"));
+        assert_eq!(
+            generation_inputs["references"],
+            json!([{ "id": "reference" }])
+        );
+    }
+
    #[test]
    fn background_removal_options_preserve_queue_parameters_and_legacy_identity() {
        for (fields, mode, color) in [
@@ -7,7 +7,9 @@ use axum::{
 use serde::de::DeserializeOwned;
 use serde::{Deserialize, Serialize};
 use serde_json::{Value, json};
-use shared_contracts::assets::EditorCanvasGenerationCompletionPayload;
+use shared_contracts::assets::{
+    EditorCanvasGenerationCompletionPayload, EditorSceneGenerateRequest,
+};
 use shared_contracts::external_generation::{
    ExternalEditorGenerationJobResponse, ExternalEditorGenerationSubmissionResponse,
    ExternalGenerationJobStatus,
@@ -38,12 +40,13 @@ use crate::{
        EditorCanvasViewportPayload, EditorGenerationCaller, EditorImageEditRequest,
        EditorImageGenerationRequest, EditorProjectListQuery, EditorProjectListView,
        EditorProjectPayload, EditorProjectResourcePayload, EditorProjectSummaryListResponse,
-        EditorUiDesignAssetExtractionRequest, current_utc_micros,
-        editor_asset_folder_payload_from_record, editor_asset_library_payload_from_record,
-        editor_asset_payload_from_record, editor_idempotent_create_id,
-        editor_project_payload_from_record, editor_project_resource_payload_from_record,
-        editor_project_summary_from_record, enqueue_editor_background_removal_for_owner,
-        enqueue_editor_image_edit_for_owner, enqueue_editor_image_generation_for_owner,
+        EditorUiDesignAssetExtractionRequest, build_editor_scene_image_generation_payload,
+        current_utc_micros, editor_asset_folder_payload_from_record,
+        editor_asset_library_payload_from_record, editor_asset_payload_from_record,
+        editor_idempotent_create_id, editor_project_payload_from_record,
+        editor_project_resource_payload_from_record, editor_project_summary_from_record,
+        enqueue_editor_background_removal_for_owner, enqueue_editor_image_edit_for_owner,
+        enqueue_editor_image_generation_for_owner,
        enqueue_editor_ui_design_asset_extraction_for_owner,
        ensure_generic_editor_image_generation_contract, map_editor_project_error,
        normalize_editor_persisted_media_src, normalize_optional_string,
@@ -750,6 +753,29 @@ pub async fn generate_external_editor_image(
    Ok(external_generation_accepted_response(&request_context, job))
 }

+pub async fn generate_external_editor_scene(
+    State(state): State<AppState>,
+    Extension(request_context): Extension<RequestContext>,
+    Extension(principal): Extension<ExternalApiPrincipal>,
+    headers: HeaderMap,
+    payload: Result<Json<EditorSceneGenerateRequest>, JsonRejection>,
+) -> Result<Response, AppError> {
+    let Json(payload) = parse_editor_generation_json_payload(payload)?;
+    require_scope(&principal, SCOPE_EDITOR_IMAGE_GENERATE)?;
+    let idempotency_key = require_idempotency_key(&headers)?;
+    let project_id = payload.project_id.clone();
+    let image_payload = build_editor_scene_image_generation_payload(payload)?;
+    let job = enqueue_editor_image_generation_for_owner(
+        &state,
+        &request_context,
+        &editor_generation_caller(&principal, project_id),
+        image_payload,
+        Some(idempotency_key),
+    )
+    .await?;
+    Ok(external_generation_accepted_response(&request_context, job))
+}
+
 pub async fn edit_external_editor_image(
    State(state): State<AppState>,
    Extension(request_context): Extension<RequestContext>,
@@ -1792,6 +1818,61 @@ mod tests {
        .await;
    }

+    #[tokio::test]
+    async fn external_scene_generation_rejects_invalid_intent_before_queueing() {
+        let state = AppState::new(crate::config::AppConfig::default())
+            .expect("external scene test state should build");
+        state.fail_test_editor_generation_enqueue();
+        let app = Router::new()
+            .route(
+                "/api/external/v1/editor/scenes/generations",
+                post(generate_external_editor_scene),
+            )
+            .layer(Extension(request_context(false)))
+            .layer(Extension(ExternalApiPrincipal::for_test(
+                "user-external-scene",
+                &[SCOPE_EDITOR_IMAGE_GENERATE],
+            )))
+            .with_state(state.clone());
+
+        for (case_name, request_body) in [
+            (
+                "empty sceneContent",
+                json!({"sceneContent": "   ", "stylePreset": "anime"}),
+            ),
+            (
+                "unknown stylePreset",
+                json!({"sceneContent": "雨夜小镇", "stylePreset": "oil-painting"}),
+            ),
+            (
+                "custom without customStyle",
+                json!({"sceneContent": "雨夜小镇", "stylePreset": "custom"}),
+            ),
+            ("missing sceneContent", json!({"stylePreset": "anime"})),
+        ] {
+            let response = app
+                .clone()
+                .oneshot(
+                    axum::http::Request::builder()
+                        .method("POST")
+                        .uri("/api/external/v1/editor/scenes/generations")
+                        .header("content-type", "application/json")
+                        .header(IDEMPOTENCY_KEY_HEADER, "scene-contract-test")
+                        .body(Body::from(request_body.to_string()))
+                        .expect("external scene request should build"),
+                )
+                .await
+                .expect("external scene response should return");
+
+            assert_eq!(response.status(), StatusCode::BAD_REQUEST, "{case_name}");
+            assert_eq!(
+                state.test_editor_generation_enqueue_attempts(),
+                0,
+                "{case_name} must fail before queueing",
+            );
+        }
+    }
+
    #[tokio::test]
    async fn external_background_removal_rejects_invalid_parameters_before_queueing() {
        let state = AppState::new(crate::config::AppConfig::default())
@@ -2221,6 +2302,21 @@ mod tests {
        }
    }

+    #[test]
+    fn external_openapi_documents_dedicated_scene_generation_route() {
+        let parsed: Value = serde_json::from_str(OPENAPI_JSON).expect("openapi json should parse");
+
+        let operation = &parsed["paths"]["/api/external/v1/editor/scenes/generations"]["post"];
+        assert_eq!(
+            operation["requestBody"]["content"]["application/json"]["schema"]["$ref"],
+            json!("#/components/schemas/EditorSceneGenerationRequest")
+        );
+        assert_eq!(
+            parsed["components"]["schemas"]["EditorSceneGenerationRequest"]["required"],
+            json!(["sceneContent", "stylePreset"])
+        );
+    }
+
    #[test]
    fn exported_openapi_json_contains_external_editor_routes_and_security() {
        let parsed: Value = serde_json::from_str(OPENAPI_JSON).expect("openapi json should parse");
@@ -19,12 +19,12 @@ use crate::{
        delete_external_editor_project, edit_external_editor_image,
        extract_external_editor_ui_design_assets, generate_external_editor_background_music,
        generate_external_editor_character_animation, generate_external_editor_icon_spritesheet,
-        generate_external_editor_image, generate_external_editor_sound_effect,
-        generate_external_editor_video, get_external_editor_asset_library,
-        get_external_editor_generation_job, get_external_editor_project,
-        list_external_editor_projects, load_recent_external_editor_project, openapi_json,
-        remove_external_editor_image_background, rename_external_editor_project,
-        save_external_editor_canvas, update_external_editor_asset,
+        generate_external_editor_image, generate_external_editor_scene,
+        generate_external_editor_sound_effect, generate_external_editor_video,
+        get_external_editor_asset_library, get_external_editor_generation_job,
+        get_external_editor_project, list_external_editor_projects,
+        load_recent_external_editor_project, openapi_json, remove_external_editor_image_background,
+        rename_external_editor_project, save_external_editor_canvas, update_external_editor_asset,
        update_external_editor_asset_folder,
    },
    external_mcp,
@@ -111,6 +111,10 @@ pub fn router(state: AppState) -> Router<AppState> {
            "/api/external/v1/editor/images/generations",
            post(generate_external_editor_image),
        ),
+        (
+            "/api/external/v1/editor/scenes/generations",
+            post(generate_external_editor_scene),
+        ),
        (
            "/api/external/v1/editor/images/edits",
            post(edit_external_editor_image),
@@ -257,6 +261,7 @@ mod route_contract_tests {
        ),
        ("/api/external/v1/generations/{operation_id}", &["GET"]),
        ("/api/external/v1/editor/images/generations", &["POST"]),
+        ("/api/external/v1/editor/scenes/generations", &["POST"]),
        ("/api/external/v1/editor/images/edits", &["POST"]),
        (
            "/api/external/v1/editor/images/background-removals",