合并编辑器素材修复分支

合并 codex/240e-editor-asset-fixes 到 codex/editor-asset-library

保留视频生成资源与素材返回

保留视频缩略图与生成输入元数据

src/components/image-editor/ImageCanvasEditorModel.ts

@@ -692,6 +692,7 @@ export function mapAssetLibrarySnapshot(
       const mediaType = inferEditorAssetMediaType(
         asset.imageSrc,
         asset.objectKey ?? undefined,
+        asset.assetKind,
       );
       return {
         id: asset.assetId,
@@ -725,7 +726,14 @@ export function mapAssetLibrarySnapshot(
 export function inferEditorAssetMediaType(
   imageSrc: string,
   objectKey?: string | null,
+  assetKind?: string | null,
 ): CanvasMediaType {
+  if (assetKind === 'video') {
+    return 'video';
+  }
+  if (assetKind === 'sound-effect' || assetKind === 'background-music') {
+    return 'audio';
+  }
   const source = `${objectKey ?? ''} ${imageSrc}`.toLowerCase();
   const sourceWithoutQuery = source.split(/[?#]/u)[0] ?? source;
   if (sourceWithoutQuery.includes('.mp4')) {