Enforce Genarrative play-type SOP and update docs

Rewrite Genarrative play-type integration guidance across .codex and .hermes to define a platform-level SOP: default to form/image workbench, unify single-image asset slots (CreativeImageInputPanel), standardize series-material sheet->cut->transparent->OSS pipeline, and forbid copying legacy chat/agent workflows as the default. Add decision-log entry freezing the SOP and a pitfalls note warning against direct reuse of old play tools. Update CONTEXT.md and docs/README.md, add a new PRD file, and apply related small server-side changes (module-auth, spacetime-client mappers and runtime) to align back-end code with the new contracts and flows.

server-rs/crates/api-server/src/match3d/draft.rs

@@ -532,7 +532,9 @@ fn build_config_from_message(
     }
 }
 
-pub(super) fn resolve_config_or_default(config: Option<&Match3DCreatorConfigRecord>) -> Match3DConfigJson {
+pub(super) fn resolve_config_or_default(
+    config: Option<&Match3DCreatorConfigRecord>,
+) -> Match3DConfigJson {
     config
         .map(|config| Match3DConfigJson {
             theme_text: config.theme_text.clone(),
@@ -595,7 +597,10 @@ fn build_match3d_assistant_reply(config: &Match3DConfigJson) -> String {
     )
 }
 
-pub(super) fn build_match3d_assistant_reply_for_turn(config: &Match3DConfigJson, current_turn: u32) -> String {
+pub(super) fn build_match3d_assistant_reply_for_turn(
+    config: &Match3DConfigJson,
+    current_turn: u32,
+) -> String {
     match current_turn {
         0 => MATCH3D_QUESTION_THEME.to_string(),
         1 => MATCH3D_QUESTION_CLEAR_COUNT.to_string(),

server-rs/crates/api-server/src/match3d/mappers.rs

@@ -134,12 +134,11 @@ pub(super) fn map_match3d_draft_response(
     draft: Match3DResultDraftRecord,
 ) -> Match3DResultDraftResponse {
     // 中文注释：session draft 自身也可能携带生成素材快照，不能只依赖 work detail 回读补齐 UI 背景和容器图。
-    let generated_item_assets = parse_match3d_generated_item_assets(
-        draft.generated_item_assets_json.as_deref(),
-    )
-    .into_iter()
-    .map(Match3DGeneratedItemAsset::from)
-    .collect::<Vec<_>>();
+    let generated_item_assets =
+        parse_match3d_generated_item_assets(draft.generated_item_assets_json.as_deref())
+            .into_iter()
+            .map(Match3DGeneratedItemAsset::from)
+            .collect::<Vec<_>>();
     let background_asset = find_match3d_generated_background_asset(&generated_item_assets);
     let mut response = Match3DResultDraftResponse {
         profile_id: draft.profile_id,

server-rs/crates/api-server/src/match3d/vector_engine_gemini.rs

@@ -26,6 +26,7 @@ pub(super) async fn generate_match3d_material_sheet(
 
     Ok(Match3DMaterialSheet {
         task_id: generated.task_id,
+        prompt,
         image,
     })
 }

server-rs/crates/api-server/src/match3d/works.rs

@@ -587,7 +587,10 @@ async fn load_match3d_container_reference_image() -> Result<OpenAiReferenceImage
     })
 }
 
-pub(super) fn build_match3d_background_generation_prompt(config: &Match3DConfigJson, prompt: &str) -> String {
+pub(super) fn build_match3d_background_generation_prompt(
+    config: &Match3DConfigJson,
+    prompt: &str,
+) -> String {
     let style_clause = resolve_match3d_asset_style_prompt(config)
         .map(|style| format!("整体美术风格参考：{style}。"))
         .unwrap_or_default();
@@ -596,7 +599,10 @@ pub(super) fn build_match3d_background_generation_prompt(config: &Match3DConfigJ
     )
 }
 
-pub(super) fn build_match3d_container_generation_prompt(config: &Match3DConfigJson, prompt: &str) -> String {
+pub(super) fn build_match3d_container_generation_prompt(
+    config: &Match3DConfigJson,
+    prompt: &str,
+) -> String {
     let style_clause = resolve_match3d_asset_style_prompt(config)
         .map(|style| format!("整体美术风格参考：{style}。"))
         .unwrap_or_default();
@@ -1183,7 +1189,9 @@ pub(super) async fn persist_match3d_generated_bytes(
     })
 }
 
-pub(super) fn require_match3d_oss_client(state: &AppState) -> Result<&platform_oss::OssClient, AppError> {
+pub(super) fn require_match3d_oss_client(
+    state: &AppState,
+) -> Result<&platform_oss::OssClient, AppError> {
     state
         .oss_client()
         .ok_or_else(|| match3d_oss_config_error(&state.config))