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/models/alert.go

@@ -398,14 +398,36 @@ type AcknowledgeAlertRequest struct {
 // CreateNotifyChannelRequest 创建通知渠道请求
 type CreateNotifyChannelRequest struct {
 	Name   string `json:"name" binding:"required"`
-	Type   string `json:"type" binding:"required,oneof=email sms webhook dingtalk wechat"`
+	Type   string `json:"type" binding:"required,oneof=email sms webhook dingtalk wechat feishu"`
 	Config string `json:"config"`
 }
 
 // UpdateNotifyChannelRequest 更新通知渠道请求
 type UpdateNotifyChannelRequest struct {
 	Name    string `json:"name"`
-	Type    string `json:"type" binding:"omitempty,oneof=email sms webhook dingtalk wechat"`
+	Type    string `json:"type" binding:"omitempty,oneof=email sms webhook dingtalk wechat feishu"`
 	Config  string `json:"config"`
 	Enabled *bool  `json:"enabled"`
 }
+
+// FeishuWebhookConfig 飞书 Webhook 配置
+type FeishuWebhookConfig struct {
+	URL    string `json:"url"`    // 飞书机器人 webhook 地址
+	Secret string `json:"secret"` // 可选：签名密钥
+}
+
+// FeishuCardMessage 飞书卡片消息
+type FeishuCardMessage struct {
+	MsgType string        `json:"msg_type"`
+	Content FeishuCardContent `json:"content"`
+}
+
+type FeishuCardContent struct {
+	Title   string                `json:"title"`
+	Content [][]FeishuCardElement `json:"content"`
+}
+
+type FeishuCardElement struct {
+	Tag  string `json:"tag"`
+	Text string `json:"text,omitempty"`
+}