Refactor backend APIs to RESTful route patterns.

Align group and conversation handlers/services with path-based endpoints, and unify response/service error handling for related modules.

Made-with: Cursor

internal/dto/converter.go

@@ -357,6 +357,18 @@ func ConvertPostsToResponse(posts []*model.Post, isLikedMap, isFavoritedMap map[
 	return result
 }
 
+// BuildPostResponse 构建单个帖子响应（包含交互状态）
+// 这是一个语义化的辅助函数，便于 Handler 层调用
+func BuildPostResponse(post *model.Post, isLiked, isFavorited bool) *PostResponse {
+	return ConvertPostToResponse(post, isLiked, isFavorited)
+}
+
+// BuildPostsWithInteractionResponse 批量构建帖子响应（包含交互状态）
+// 这是一个语义化的辅助函数，便于 Handler 层调用
+func BuildPostsWithInteractionResponse(posts []*model.Post, isLikedMap, isFavoritedMap map[string]bool) []*PostResponse {
+	return ConvertPostsToResponse(posts, isLikedMap, isFavoritedMap)
+}
+
 // ==================== Comment 转换 ====================
 
 // ConvertCommentToResponse 将Comment转换为CommentResponse