refactor(WebSocket): migrate from SSE to WebSocket for real-time messaging

- Replaced SSEClient with WSClient for handling real-time messaging.
- Updated ProcessMessageUseCase to initialize WebSocket listeners.
- Refactored messageService to prioritize WebSocket for sending messages, with fallback to HTTP.
- Removed sseService and adjusted imports across the application to utilize wsService.
- Enhanced message handling and connection management for improved performance and reliability.

src/types/dto.ts

@@ -684,31 +684,37 @@ export interface GroupAnnouncementListResponse {
   total_pages: number;
 }
 
-// ==================== SSE Event Types ====================
+// ==================== WS Event Types ====================
 
-// SSE 事件类型
-export type SSEEventType = 'message' | 'notice' | 'request' | 'meta';
+// WS 事件类型
+export type WSEventType = 'message' | 'notice' | 'request' | 'meta';
 
-// SSE 消息详细类型
-export type SSEDetailType = 'private' | 'group' | 'follow' | 'like' | 'comment' | 'request' | 'typing' | 'heartbeat' | 'read';
+// WS 消息详细类型
+export type WSDetailType = 'private' | 'group' | 'follow' | 'like' | 'comment' | 'request' | 'typing' | 'heartbeat' | 'read';
 
-// SSE 事件消息段（与后端 message 字段一致）
-export interface SSESegment {
+// WS 事件消息段（与后端 message 字段一致）
+export interface WSSegment {
   type: string;
   data: Record<string, any>;
 }
 
-// SSE 事件（后端推送的事件格式）
-export interface SSEEvent {
+// WS 事件（后端推送的事件格式）
+export interface WSEvent {
   id: string;                    // 事件唯一ID
   time: number;                  // 事件时间戳（毫秒）
-  type: SSEEventType;              // 事件类型: message(消息), notice(通知), request(请求), meta(元事件)
-  detail_type: SSEDetailType;     // 详细类型: private(私聊), group(群聊), follow(关注), like(点赞)等
+  type: WSEventType;              // 事件类型: message(消息), notice(通知), request(请求), meta(元事件)
+  detail_type: WSDetailType;     // 详细类型: private(私聊), group(群聊), follow(关注), like(点赞)等
   seq: string;                   // 消息序号
-  message?: SSESegment[];         // 消息内容数组
+  message?: WSSegment[];         // 消息内容数组
   conversation_id: string;        // 会话ID
 }
 
+// 旧的类型名称，保持向后兼容
+export type SSEEventType = WSEventType;
+export type SSEDetailType = WSDetailType;
+export interface SSESegment extends WSSegment {}
+export interface SSEEvent extends WSEvent {}
+
 /**
  * 从消息segments中提取纯文本内容
  * 用于消息列表显示、通知等场景