fix(P1): 视频库左侧列表只显示video类型库，过滤配音库

- 视频库页面左侧列表增加kind===video过滤
- 防止配音素材库出现在视频库列表中造成混淆
- 配音素材库独立页面（/app/voice-materials）管理

apps/web/src/pages/assets/AssetLibrary.tsx

@@ -358,7 +358,10 @@ const AssetLibrary: React.FC = () => {
   })
 
   const libraries = useMemo(
-    () => (Array.isArray(apiLibraries) ? apiLibraries : []).map(mapLibrary),
+    () =>
+      (Array.isArray(apiLibraries) ? apiLibraries : [])
+        .map(mapLibrary)
+        .filter((lib) => lib.kind === "video"),
     [apiLibraries],
   )