feat(alert-center): 添加飞书Webhook通知渠道 + 告警引擎实时通知

- 后端: NotifyChannel 模型新增 feishu 类型, FeishuWebhookConfig
- 后端: TestNotifyChannel 真实发送飞书测试消息(文本格式)
- 后端: 告警引擎触发/恢复时自动发送飞书通知(sendFeishuAlert/sendFeishuRecovery)
- 后端: AlertEngine 新增 tcp_time_wait/tcp_close_wait/service_process 指标检测
- 后端: NetworkStatModel 新增 TCPCloseWait 字段
- 后端: QuickSetupRules 一键创建6条告警规则(CPU/内存/磁盘/TIME_WAIT/CLOSE_WAIT/进程)
- 后端: 注册 /alerts/quick-setup 路由
- 前端: AlertChannelDialog 新增飞书类型选项
- 前端: helpers 新增 getChannelIcon/getChannelTypeLabel 支持 feishu/dingtalk/wechat

backend/internal/api/handlers/agent.go

@@ -51,6 +51,12 @@ func (h *AgentHandler) ReceiveReport(c *gin.Context) {
 	portJSON, _ := json.Marshal(req.Ports)
 	netJSON, _ := json.Marshal(req.Network)
 	dioJSON, _ := json.Marshal(req.DiskIO)
+	// v2.0 新增
+	swapJSON, _ := json.Marshal(req.Swap)
+	processTopJSON, _ := json.Marshal(req.ProcessTop)
+	fdJSON, _ := json.Marshal(req.FD)
+	csJSON, _ := json.Marshal(req.ContextSwitches)
+	heartbeatJSON, _ := json.Marshal(req.Heartbeat)
 
 	// 存储到数据库
 	report := models.AgentReport{
@@ -67,6 +73,12 @@ func (h *AgentHandler) ReceiveReport(c *gin.Context) {
 		PortInfo:   string(portJSON),
 		NetInfo:    string(netJSON),
 		DiskIOInfo: string(dioJSON),
+		// v2.0 新增
+		SwapInfo:       string(swapJSON),
+		ProcessTopInfo: string(processTopJSON),
+		FDInfo:         string(fdJSON),
+		CSInfo:         string(csJSON),
+		HeartbeatInfo:  string(heartbeatJSON),
 		ReportTime: reportTime,
 	}
 
@@ -264,6 +276,11 @@ func (h *AgentHandler) GetLatestReports(c *gin.Context) {
 			a.port_info,
 			a.net_info,
 			a.disk_io_info,
+			a.swap_info,
+			a.process_top_info,
+			a.fd_info,
+			a.cs_info,
+			a.heartbeat_info,
 			a.report_time,
 			COALESCE(s.agent_version, '') as agent_version,
 			CASE