Merge branch 'codex/editor-asset-metadata-migration' into codex/editor-asset-library

# Conflicts:
#	docs/project-memory/shared-memory/decision-log.md
#	server-rs/crates/api-server/src/editor_project.rs
#	src/components/image-editor/ImageCanvasEditorModel.ts
#	src/components/image-editor/ImageCanvasEditorView.test-utils.ts
#	src/components/image-editor/ImageCanvasEditorView.tsx
#	src/components/image-editor/useImageCanvasGenerationSubmissionWorkflow.ts
#	src/services/image-editor/editorProjectClient.test.ts

src/components/image-editor/ImageCanvasGenerationLayerModel.test.ts

@@ -98,6 +98,57 @@ describe('ImageCanvasGenerationLayerModel', () => {
     expect(layer.generationInputs?.fields[0]?.value).toBe('生成提示词');
   });
 
+  it('uses backend-persisted resource and asset snapshots for generated layers', () => {
+    const generationInputs = createGenerationInputs();
+    const layer = createGeneratedResultLayer({
+      generated: createGenerated({
+        resource: {
+          resourceId: 'resource-generated-bff',
+          projectId: 'editor-project-1',
+          imageSrc: 'data:image/png;base64,generated',
+          objectKey: 'generated/from-resource.png',
+          assetObjectId: 'asset-object-from-resource',
+          width: 1024,
+          height: 1024,
+          sourceType: 'generated',
+          assetKind: 'character',
+          generationInputs,
+        },
+        asset: {
+          assetId: 'asset-generated-bff',
+          folderId: 'user-1:asset-folder:project',
+          label: '角色形象',
+          imageSrc: 'data:image/png;base64,generated',
+          objectKey: 'generated/from-asset.png',
+          assetObjectId: 'asset-object-from-asset',
+          width: 1024,
+          height: 1024,
+          sourceType: 'generated',
+          assetKind: 'character',
+          generationInputs,
+        },
+      }),
+      generatedIndex: 9,
+      canvasSize: { width: 900, height: 640 },
+      viewport: { x: 0, y: 0, scale: 1 },
+      assetKind: 'spec',
+      generationInputs: {
+        fields: [{ title: '旧输入', value: '本地兜底' }],
+        references: [],
+      },
+    });
+
+    expect(layer).toMatchObject({
+      resourceId: 'resource-generated-bff',
+      sourceAssetId: 'asset-generated-bff',
+      objectKey: 'generated/from-resource.png',
+      assetObjectId: 'asset-object-from-resource',
+      assetKind: 'character',
+    });
+    expect(layer.generationInputs?.fields[0]?.value).toBe('生成提示词');
+    expect(layer.generatedAssetSnapshot?.assetId).toBe('asset-generated-bff');
+  });
+
   it('creates edit result layers beside the source image', () => {
     const sourceLayer = createSourceLayer();
     const layer = createGeneratedResultLayer({