Replace websocket flow with SSE support in backend.

Update handlers, services, router, and data conversion logic to support server-sent events and related message pipeline changes.

Made-with: Cursor

internal/repository/user_repo.go

@@ -177,7 +177,9 @@ func (r *UserRepository) RefreshFollowersCount(userID string) error {
 // GetPostsCount 获取用户帖子数（实时计算）
 func (r *UserRepository) GetPostsCount(userID string) (int64, error) {
 	var count int64
-	err := r.db.Model(&model.Post{}).Where("user_id = ?", userID).Count(&count).Error
+	err := r.db.Model(&model.Post{}).
+		Where("user_id = ? AND status = ?", userID, model.PostStatusPublished).
+		Count(&count).Error
 	return count, err
 }
 
@@ -202,7 +204,7 @@ func (r *UserRepository) GetPostsCountBatch(userIDs []string) (map[string]int64,
 	var counts []CountResult
 	err := r.db.Model(&model.Post{}).
 		Select("user_id, count(*) as count").
-		Where("user_id IN ?", userIDs).
+		Where("user_id IN ? AND status = ?", userIDs, model.PostStatusPublished).
 		Group("user_id").
 		Scan(&counts).Error
 	if err != nil {