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

backend/internal/api/routes/routes.go

@@ -674,6 +674,8 @@ func Register(r *gin.Engine, db *gorm.DB, log *zap.Logger, cfg *config.Config, c
 		agentGroup.POST("/tasks/:task_id/result", taskHandler.SubmitResult)
 		agentGroup.POST("/aggregate", agentHandler.AggregateMetrics)
 		agentGroup.POST("/exec", agentInstallHandler.RemoteExec)
+		// 健康探针：Agent 拉取本机配置（无需 JWT）
+		agentGroup.GET("/health-probes/config", agentHandler.GetHealthProbesForAgent)
 	}
 	// Agent 数据查询 + 任务管理（需要 JWT）
 	agentQuery := authorized.Group("/agent")
@@ -702,6 +704,12 @@ func Register(r *gin.Engine, db *gorm.DB, log *zap.Logger, cfg *config.Config, c
 		agentQuery.POST("/uninstall", agentInstallHandler.UninstallAgent)
 		agentQuery.POST("/batch-uninstall", agentInstallHandler.BatchUninstallAgent)
 		agentQuery.POST("/batch-upgrade", agentInstallHandler.BatchUpgradeAgent)
+
+		// 健康探针管理（CRUD）
+		agentQuery.GET("/health-probes", agentHandler.ListHealthProbes)
+		agentQuery.POST("/health-probes", agentHandler.CreateHealthProbe)
+		agentQuery.PUT("/health-probes/:id", agentHandler.UpdateHealthProbe)
+		agentQuery.DELETE("/health-probes/:id", agentHandler.DeleteHealthProbe)
 	}
 
 	// Agent 二进制下载（无需鉴权，Agent 升级时使用）