feat: v0.34 健康探针(Architecture B) + Agent v2.1 + 端口监控 + 告警联系人重构

- v0.31: AlertContact 重构(channel_type下拉+webhook_url替代三分立字段)
- v0.32: Agent ProcessTop 增强(cmdline/user/cpu_pct/mem_pct)
- v0.33: 端口监控 Tab(监听端口自动发现+down联动告警)
- v0.34: 健康探针(Agent本地执行HTTP/TCP/Exec→结果随心跳上报)
- Agent新增: ContextSwitch/FD/HealthProbe采集器
- 后端新增: health_probe handler + Agent model扩展
- HostMonitor新增Tab: 健康探针/端口监控

frontend/src/services/api.ts

@@ -885,6 +885,11 @@ export const agentApi = {
   batchUpgrade: (serverIds: number[]) => http.post('/agent/batch-upgrade', { server_ids: serverIds }),
   listAlerts: (params?: Record<string, string>) => http.get('/agent/alerts', params),
   resolveAlert: (id: number) => http.post(`/agent/alerts/${id}/resolve`),
+  // 健康探针
+  getHealthProbes: (params?: Record<string, string>) => http.get('/agent/health-probes', params),
+  createHealthProbe: (data: any) => http.post('/agent/health-probes', data),
+  updateHealthProbe: (id: number, data: any) => http.put(`/agent/health-probes/${id}`, data),
+  deleteHealthProbe: (id: number) => http.delete(`/agent/health-probes/${id}`),
 };
 
 // ==================== 区域管理 API ====================