Clean backend debug logging and standardize error reporting.

This removes verbose trace output in handlers/services and keeps only actionable error-level logs.

internal/handler/websocket_handler.go

@@ -106,13 +106,6 @@ func (h *WebSocketHandler) HandleWebSocket(c *gin.Context) {
 		return
 	}
 
-	// 如果用户已在线，先注销旧连接
-	if h.wsManager.IsUserOnline(userID) {
-		log.Printf("[DEBUG] 用户 %s 已有在线连接，复用该连接", userID)
-	} else {
-		log.Printf("[DEBUG] 用户 %s 当前不在线，创建新连接", userID)
-	}
-
 	// 创建客户端
 	client := &ws.Client{
 		ID:      userID,
@@ -129,7 +122,6 @@ func (h *WebSocketHandler) HandleWebSocket(c *gin.Context) {
 	go client.WritePump()
 	go h.handleMessages(client)
 
-	log.Printf("[DEBUG] WebSocket连接建立: userID=%s, 当前在线=%v", userID, h.wsManager.IsUserOnline(userID))
 }
 
 // handleMessages 处理客户端消息
@@ -233,8 +225,6 @@ func (h *WebSocketHandler) handleChatMessage(client *ws.Client, msg *ws.WSMessag
 		return
 	}
 
-	log.Printf("[DEBUG handleChatMessage] 完整data: %+v", data)
-
 	conversationIDStr, _ := data["conversationId"].(string)
 
 	if conversationIDStr == "" {
@@ -293,8 +283,6 @@ func (h *WebSocketHandler) handleChatMessage(client *ws.Client, msg *ws.WSMessag
 	})
 	if client.Send != nil {
 		msgBytes, _ := json.Marshal(metaAckMsg)
-		log.Printf("[DEBUG handleChatMessage] 私聊 ack 消息: %s", string(msgBytes))
-		log.Printf("[DEBUG handleChatMessage] message.Segments 类型: %T, 值: %+v", message.Segments, message.Segments)
 		client.Send <- msgBytes
 	}
 }
@@ -507,9 +495,6 @@ func (h *WebSocketHandler) handleGroupMessage(client *ws.Client, msg *ws.WSMessa
 
 	// 发送确认消息给发送者（作为meta事件）
 	// 使用 meta 事件格式发送 ack
-	log.Printf("[DEBUG HandleGroupMessageSend] 准备发送 ack 消息, userID=%s, messageID=%s, seq=%d",
-		client.UserID, savedMessage.ID, savedMessage.Seq)
-
 	metaAckMsg := ws.CreateWSMessage("meta", map[string]interface{}{
 		"detail_type":     ws.MetaDetailTypeAck,
 		"conversation_id": conversationID,
@@ -523,8 +508,6 @@ func (h *WebSocketHandler) handleGroupMessage(client *ws.Client, msg *ws.WSMessa
 	})
 	if client.Send != nil {
 		msgBytes, _ := json.Marshal(metaAckMsg)
-		log.Printf("[DEBUG HandleGroupMessageSend] 发送 ack 消息到 channel, userID=%s, msg=%s",
-			client.UserID, string(msgBytes))
 		client.Send <- msgBytes
 	} else {
 		log.Printf("[ERROR HandleGroupMessageSend] client.Send 为 nil, userID=%s", client.UserID)