切换图片画布抠图到 BiRefNet

新增图片画布去背景 BFF 配置与路由，服务端代理 BiRefNet 并持久化结果。

将手动去背景、角色图、图标 spritesheet、UI 素材提取和角色动作帧抠图切到 BiRefNet。

新增画布右上角任务侧栏并展示去背景任务耗时与状态。

同步图片画布技术文档和项目决策记录。

(cherry picked from commit 495fcc8801)

src/services/image-editor/editorProjectClient.ts

@@ -8,6 +8,7 @@ const EDITOR_SHOWCASE_RESOURCE_API = '/api/editor/showcase/resources';
 const EDITOR_PROJECT_RESOURCE_API_BASE = '/api/editor/project-resources';
 const EDITOR_IMAGE_GENERATION_API = '/api/editor/images/generations';
 const EDITOR_IMAGE_EDIT_API = '/api/editor/images/edits';
+const EDITOR_BACKGROUND_REMOVAL_API = '/api/editor/images/background-removals';
 const EDITOR_ICON_SPRITESHEET_GENERATION_API =
   '/api/editor/icon-spritesheets/generations';
 const EDITOR_UI_DESIGN_ASSET_EXTRACTION_API =
@@ -198,6 +199,10 @@ export type EditorImageEditInput = {
   canvasCompletion?: EditorCanvasGenerationCompletionInput | null;
 };
 
+export type EditorBackgroundRemovalInput = {
+  sourceImageSrc: string;
+};
+
 export type EditorImageGenerationResult = {
   imageSrc: string;
   objectKey?: string | null;
@@ -216,6 +221,17 @@ export type EditorImageGenerationResult = {
   queueState?: ExternalGenerationJobStatusRecord | null;
 };
 
+export type EditorBackgroundRemovalResult = {
+  imageSrc: string;
+  objectKey?: string | null;
+  assetObjectId?: string | null;
+  width: number;
+  height: number;
+  taskId?: string | null;
+  elapsedMs?: number;
+  provider?: string;
+};
+
 export type EditorIconSpritesheetIconResult = {
   name: string;
   imageSrc: string;
@@ -353,7 +369,6 @@ export type EditorVideoGenerationResult = {
   resource?: EditorProjectResourceSnapshot | null;
   asset?: EditorAssetSnapshot | null;
   project?: EditorProjectSnapshot | null;
-  asset?: EditorAssetSnapshot | null;
   queueState?: ExternalGenerationJobStatusRecord | null;
 };
 
@@ -517,6 +532,7 @@ type EditorAssetResponse = {
 };
 
 type EditorImageGenerationResponse = EditorImageGenerationResult;
+type EditorBackgroundRemovalResponse = EditorBackgroundRemovalResult;
 type EditorIconSpritesheetGenerationResponse =
   EditorIconSpritesheetGenerationResult;
 type EditorVideoGenerationResponse = EditorVideoGenerationResult;
@@ -866,6 +882,22 @@ export async function editEditorImage(input: EditorImageEditInput) {
   );
 }
 
+export async function removeEditorImageBackground(
+  input: EditorBackgroundRemovalInput,
+) {
+  return requestJson<EditorBackgroundRemovalResponse>(
+    EDITOR_BACKGROUND_REMOVAL_API,
+    jsonRequest('POST', {
+      sourceImageSrc: input.sourceImageSrc,
+    }),
+    '去除背景失败',
+    {
+      timeoutMs: 1_200_000,
+      retry: EDITOR_REQUEST_RETRY_OPTIONS,
+    },
+  );
+}
+
 export async function generateEditorCharacterAnimation(
   input: EditorCharacterAnimationGenerationInput,
 ) {