后端写入画布生成完成态

后端在图片生成完成后直接写入画布布局和生成器状态

前端提交canvasCompletion并只应用后端项目快照刷新显示

移除项目加载时根据资源行推断生成完成态的路径

更新OpenAPI、图片画布文档和共享排障记忆

docs/openapi/genarrative-external-v1.openapi.json

@@ -2555,6 +2555,74 @@
               "string",
               "null"
             ]
+          },
+          "canvasCompletion": {
+            "anyOf": [
+              {
+                "$ref": "#/components/schemas/EditorCanvasGenerationCompletion"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "description": "带项目上下文生成时，服务端据此直接写入画布完成态并返回最新项目快照。"
+          }
+        },
+        "additionalProperties": false
+      },
+      "EditorCanvasGenerationCompletion": {
+        "type": "object",
+        "required": [
+          "dialogId",
+          "title",
+          "placeholder"
+        ],
+        "properties": {
+          "dialogId": {
+            "type": "string",
+            "minLength": 1
+          },
+          "title": {
+            "type": "string"
+          },
+          "placeholder": {
+            "$ref": "#/components/schemas/EditorCanvasGenerationPlaceholder"
+          }
+        },
+        "additionalProperties": false
+      },
+      "EditorCanvasGenerationPlaceholder": {
+        "type": "object",
+        "required": [
+          "x",
+          "y",
+          "width",
+          "height",
+          "originalWidth",
+          "originalHeight"
+        ],
+        "properties": {
+          "x": {
+            "type": "number"
+          },
+          "y": {
+            "type": "number"
+          },
+          "width": {
+            "type": "number",
+            "minimum": 1
+          },
+          "height": {
+            "type": "number",
+            "minimum": 1
+          },
+          "originalWidth": {
+            "type": "number",
+            "minimum": 1
+          },
+          "originalHeight": {
+            "type": "number",
+            "minimum": 1
           }
         },
         "additionalProperties": false
@@ -2687,6 +2755,17 @@
                 "type": "null"
               }
             ]
+          },
+          "project": {
+            "anyOf": [
+              {
+                "$ref": "#/components/schemas/EditorProject"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "description": "当请求携带 canvasCompletion 且服务端成功写入画布布局时返回最新项目快照。"
           }
         }
       },