feat(pagination): add updateItem for in-place list updates and optimize notifications

Add `updateItem` function to cursor pagination hook for updating single items
without full list refresh. Use this in NotificationsScreen to mark messages
as read locally instead of refetching. Also add `is_blocked` detection in
postService and userProfile to show blocked state in profile screen.

src/services/post/postService.ts

@@ -14,6 +14,7 @@ interface PostListResponse {
   page: number;
   page_size: number;
   total_pages: number;
+  is_blocked?: boolean;
 }
 
 // 帖子响应 - API直接返回Post对象
@@ -131,7 +132,7 @@ class PostService {
     userId: string,
     page = 1,
     pageSize = 20
-  ): Promise<PaginatedData<Post>> {
+  ): Promise<PaginatedData<Post> & { is_blocked?: boolean }> {
     try {
       const response = await api.get<PostListResponse>(`/users/${userId}/posts`, {
         page,
@@ -368,13 +369,13 @@ class PostService {
   async getUserPostsCursor(
     userId: string,
     params: CursorPaginationRequest = {}
-  ): Promise<CursorPaginationResponse<Post>> {
+  ): Promise<CursorPaginationResponse<Post> & { is_blocked?: boolean }> {
     try {
       const response = await api.get<any>(
         `/users/${userId}/posts`,
         params
       );
-      
+
       const data = response.data;
 
       if (data && typeof data === 'object' && Array.isArray(data.list)) {
@@ -391,6 +392,7 @@ class PostService {
             next_cursor: currentPage < totalPages ? String(currentPage + 1) : null,
             prev_cursor: currentPage > 1 ? String(currentPage - 1) : null,
             has_more: currentPage < totalPages,
+            is_blocked: data.is_blocked,
           };
         }
         return {
@@ -398,6 +400,7 @@ class PostService {
           next_cursor: data.next_cursor ?? null,
           prev_cursor: data.prev_cursor ?? null,
           has_more: data.has_more ?? false,
+          is_blocked: data.is_blocked,
         };
       }