新增资产模块，包含云存储与媒体库流程

为云端与素材管理页面接入首页路由，将共享云存储模型迁入 Assets 模块，并补充 API/ViewModel 测试。

Co-authored-by: Cursor <cursoragent@cursor.com>

suixinkan/App/RootView.swift

@@ -29,6 +29,7 @@ struct RootView: View {
     @State private var walletAPI: WalletAPI
     @State private var scenicPermissionAPI: ScenicPermissionAPI
     @State private var taskAPI: TaskAPI
+    @State private var assetsAPI: AssetsAPI
     @State private var authSessionCoordinator: AuthSessionCoordinator
     @State private var sessionBootstrapper: SessionBootstrapper
 
@@ -51,6 +52,7 @@ struct RootView: View {
         _walletAPI = State(initialValue: WalletAPI(client: apiClient))
         _scenicPermissionAPI = State(initialValue: ScenicPermissionAPI(client: apiClient))
         _taskAPI = State(initialValue: TaskAPI(client: apiClient))
+        _assetsAPI = State(initialValue: AssetsAPI(client: apiClient))
         _authSessionCoordinator = State(
             initialValue: AuthSessionCoordinator(
                 tokenStore: tokenStore,
@@ -90,6 +92,7 @@ struct RootView: View {
             .environment(walletAPI)
             .environment(scenicPermissionAPI)
             .environment(taskAPI)
+            .environment(assetsAPI)
             .environment(authSessionCoordinator)
             .task {
                 apiClient.bindAuthTokenProvider { appSession.token }