fix: 前端消息拆分+动作消息样式+DevTools自主思考状态保持+记忆表名修复

- 侧边栏底部 "昔涟 AI" 改为 "昔涟"
- 暂时禁用消息朗读按钮
- 修复前端 response 处理器：支持 gateway 发送的 content+role+msg_type 字段，
  使动作消息(括号内容)正确拆分为独立的 ActionMessageBubble 显示
- 修复 DevTools 自主思考面板：5秒自动刷新后展开的思考日志不再自动折叠
- 修复 memory-service 表名不一致：memory_entries → memories，
  解决 DevTools 记忆管理页面查不到 admin 用户记忆的问题
- 修复 sessionStore 解析历史消息时 msgType 未定义引用

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/gateway/internal/handler/chat_handler.go

@@ -454,6 +454,30 @@ func (h *ChatHandler) handleHistoryRequest(client *ws.Client, msg ws.ClientMessa
 	}
 
 	messages := h.hub.GetConversation(client.UserID, sessionID)
+
+	// 如果内存缓存为空，尝试从数据库恢复（网关重启后缓存丢失的情况）
+	if len(messages) == 0 && h.sessionStore != nil && h.sessionStore.IsAvailable() {
+		dbMessages, err := h.sessionStore.GetMessages(sessionID, 50, 0)
+		if err == nil && len(dbMessages) > 0 {
+			log.Printf("[history] 从数据库恢复会话历史: session=%s, %d 条消息", sessionID, len(dbMessages))
+			// 恢复到内存缓存
+			for _, dbMsg := range dbMessages {
+				messages = append(messages, ws.Message{
+					ID:        fmt.Sprintf("db_%d", dbMsg.ID),
+					Role:      dbMsg.Role,
+					Content:   dbMsg.Content,
+					Timestamp: dbMsg.CreatedAt.UnixMilli(),
+				})
+				h.hub.CacheMessage(client.UserID, sessionID, ws.Message{
+					ID:        fmt.Sprintf("db_%d", dbMsg.ID),
+					Role:      dbMsg.Role,
+					Content:   dbMsg.Content,
+					Timestamp: dbMsg.CreatedAt.UnixMilli(),
+				})
+			}
+		}
+	}
+
 	if messages == nil {
 		messages = []ws.Message{}
 	}
@@ -488,6 +512,73 @@ func (h *ChatHandler) SendSystemMessage(userID, sessionID, text string) error {
 	return nil
 }
 
+// HandleProactiveMessage 处理来自 AI-Core 后台思考的主动消息
+// POST /api/v1/internal/proactive-message
+func (h *ChatHandler) HandleProactiveMessage(c *gin.Context) {
+	var req struct {
+		UserID    string `json:"user_id" binding:"required"`
+		Content   string `json:"content" binding:"required"`
+		SessionID string `json:"session_id"`
+	}
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效: " + err.Error()})
+		return
+	}
+
+	// 检查用户是否在线
+	onlineCount := h.hub.UserClientCount(req.UserID)
+	if onlineCount == 0 {
+		c.JSON(http.StatusOK, gin.H{
+			"success":   false,
+			"reason":    "user_offline",
+			"message":   "用户不在线，消息未发送",
+		})
+		return
+	}
+
+	// 构建主动消息
+	msgID := "proactive_" + generateID()
+	msg := ws.ServerMessage{
+		Type:      "response",
+		MessageID: msgID,
+		Content:   req.Content,
+		Role:      "assistant",
+		MsgType:   "proactive",
+		SessionID: req.SessionID,
+		Timestamp: time.Now().UnixMilli(),
+	}
+
+	data, err := json.Marshal(msg)
+	if err != nil {
+		log.Printf("[proactive] 序列化消息失败: %v", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "内部错误"})
+		return
+	}
+
+	h.hub.SendToUser(req.UserID, data)
+
+	// 同时缓存到对话历史（使用 admin 的主 session）
+	sessionID := req.SessionID
+	if sessionID == "" {
+		sessionID = "session_admin_main"
+	}
+	h.hub.CacheMessage(req.UserID, sessionID, ws.Message{
+		ID:        msgID,
+		Role:      "assistant",
+		Content:   req.Content,
+		Timestamp: time.Now().UnixMilli(),
+	})
+	h.hub.RecordMessage(sessionID, "assistant", req.Content)
+
+	log.Printf("[proactive] 主动消息已推送: user=%s, online=%d, content_len=%d", req.UserID, onlineCount, len(req.Content))
+
+	c.JSON(http.StatusOK, gin.H{
+		"success":   true,
+		"message":   "消息已推送",
+		"delivered": onlineCount,
+	})
+}
+
 func generateID() string {
 	return time.Now().Format("20060102150405") + randomStr(6)
 }