feat(messaging): implement optimistic updates with retry for failed messages

- Add pending/failed message status to track send state
- Implement optimistic UI: show message immediately, update on server response
- Add retry functionality for failed messages via tap-to-retry
- Change send button from icon to text "发送" for clarity
- Add MessageSendService with temp ID generation to prevent collisions

feat(notification): add JPush notification deduplication and clear on tap

- Deduplicate notificationArrived events from dual JPush/vendor channels
- Clear all notifications on tap (QQ-style behavior)

feat(post): add client-side idempotency key for post creation

- Generate client_request_id per publish intent to prevent duplicates on retry
- Pass idempotency key through to postService and voteService

src/services/post/postService.ts

@@ -27,6 +27,8 @@ interface CreatePostRequest {
   segments?: MessageSegment[];
   images?: string[];
   channel_id?: string;
+  // 客户端幂等键：同一 key 在服务端 TTL 内重复提交只创建一次，避免重复发帖
+  client_request_id?: string;
 }
 
 // 更新帖子请求
@@ -104,7 +106,6 @@ class PostService {
     const response = await api.post<PostResponse>('/posts', data);
     return response.data;
   }
-
   // 更新帖子
   async updatePost(postId: string, data: UpdatePostRequest): Promise<Post | null> {
     try {

src/services/post/voteService.ts

@@ -58,6 +58,7 @@ class VoteService {
       segments,
       images: data.images,
       channel_id: data.channel_id,
+      client_request_id: data.client_request_id,
     });
     return response.data;
   }