refactor(ImageGallery, HomeScreen, PostService, UserStore): streamline post type handling and improve tab navigation

- Updated ImageGallery to manage loading states more effectively and prevent unnecessary updates.
- Refactored HomeScreen to remove the 'recommend' post type, simplifying the post type options.
- Adjusted PostService and UserStore to eliminate references to 'recommend', ensuring consistency across the application.
- Enhanced tab navigation in SimpleMobileTabNavigator to optimize rendering and manage mounted tabs more efficiently.
- Improved error handling and loading states in various components for better user experience.

src/services/postService.ts

@@ -63,11 +63,6 @@ class PostService {
     return response.data;
   }
 
-  // 获取推荐帖子
-  async getRecommendedPosts(page = 1, pageSize = 20): Promise<PaginatedData<Post>> {
-    return this.getPosts(page, pageSize, 'recommend');
-  }
-
   // 获取关注帖子
   async getFollowingPosts(page = 1, pageSize = 20): Promise<PaginatedData<Post>> {
     return this.getPosts(page, pageSize, 'follow');
@@ -282,7 +277,7 @@ class PostService {
   /**
    * 获取帖子列表（游标分页）
    * GET /api/v1/posts
-   * @param params 游标分页请求参数（包含 post_type 可选：recommend, follow, hot, latest）
+   * @param params 游标分页请求参数（包含 post_type 可选：follow, hot, latest）
    */
    async getPostsCursor(
      params: CursorPaginationRequest = {}