Add graceful SCUM stop, restart, and version update flow

SCUM 停止/重启/更新以前只有“结束进程”这一条路，插件没有声明任何优雅关闭方式，
平台也没有把停止后重新启动串起来。现在插件声明自己的关闭脚本，run 先执行它，
平台在停止或更新成功后再自动拉起服务。

run:
- lifecycle stop 支持插件声明的 gracefulStop（可执行文件、参数、环境、超时、
  fallback=report|terminate）；关闭命令超时且声明 report 时任务失败，不再默默杀进程。
- 新增 steam.update 依赖探针：调用 steamcmd +app_info_print 获取公开分支 buildid，
  与本地 steamapps/appmanifest_<appid>.acf 的 buildid 比较，输出
  installed/latest/update=yes|no|unknown。

platform:
- 新增 POST /api/v1/server-instances/{id}/restart 与 /update。
- restart 派发插件 stop 动作（走优雅关闭），终态成功后入队 start 作业。
- update 派发插件 install 动作；插件在更新前必须先优雅关闭 SCUM，关闭失败直接拒绝
  SteamCMD 更新，成功后平台再拉起服务。
- 依赖检查输入带上插件声明的服务器安装根目录，供 steam.update 读取 appmanifest。

plugin (SCUM server plugin 0.1.16):
- bin/scum-stop.cmd：解析已声明的可执行文件路径，定位同路径正在运行的 SCUMServer.exe，
  通过本地 RCON 公告并发送关闭命令，等待进程自行退出；不再使用 taskkill。
- bin/scum-rcon.ps1：插件自有的 Source RCON 客户端，从 UE4SS mod config.ini 读取
  密码/端口，密钥不离开本机。
- actions/stop.json 声明 gracefulStop；actions/install.json 更新前先执行同一关闭脚本。

platform_web:
- 服务器详情新增“重启”按钮和“SCUM 版本更新”面板；点“检查更新”查询公开分支版本，
  只有检测到更新时“更新版本”按钮才会置为可用并高亮，点击后先确认再派发更新任务。

platform/service/resources.go

@@ -100,6 +100,8 @@ type Core interface {
 	StartServerInstanceForSession(string, domain.ServerLifecycleCommand) (domain.ServerLifecycleResult, error)
 	StopServerInstance(domain.ServerLifecycleCommand) (domain.ServerLifecycleResult, error)
 	StopServerInstanceForSession(string, domain.ServerLifecycleCommand) (domain.ServerLifecycleResult, error)
+	RestartServerInstanceForSession(string, domain.ServerLifecycleCommand) (domain.ServerLifecycleResult, error)
+	UpdateServerGameForSession(string, domain.ServerLifecycleCommand) (domain.ServerLifecycleResult, error)
 	QueryServerInstanceProcessForSession(string, domain.ServerLifecycleCommand) (domain.ServerLifecycleResult, error)
 	GetServerInstance(string) (domain.ServerInstance, error)
 	GetServerInstanceForSession(string, string) (domain.ServerInstance, error)
@@ -1194,7 +1196,7 @@ func (svc *CoreService) executeBridgeJobDispatch(sessionID string, base domain.P
 		return base
 	}
 	lifecycleAction := domain.ServerLifecycleAction(strings.TrimSpace(payload["lifecycleAction"]))
-	if lifecycleAction == domain.ServerLifecycleActionStart || lifecycleAction == domain.ServerLifecycleActionStop {
+	if lifecycleAction == domain.ServerLifecycleActionStart || lifecycleAction == domain.ServerLifecycleActionStop || lifecycleAction == domain.ServerLifecycleActionRestart || lifecycleAction == domain.ServerLifecycleActionUpdate {
 		expectedVersion, _ := strconv.Atoi(payload["expectedConfigVersion"])
 		command := domain.ServerLifecycleCommand{
 			ServerInstanceID:      instance.ID,
@@ -1218,6 +1220,20 @@ func (svc *CoreService) executeBridgeJobDispatch(sessionID string, base domain.P
 				return base
 			}
 			result, err = svc.StopServerInstanceForSession(sessionID, command)
+		case domain.ServerLifecycleActionRestart:
+			if capability != domain.LifecycleCapabilityStop {
+				base.Status = "denied"
+				base.Error = &domain.PluginBridgeSafeError{Code: "capability_denied", Message: "lifecycle action must match requested capability"}
+				return base
+			}
+			result, err = svc.RestartServerInstanceForSession(sessionID, command)
+		case domain.ServerLifecycleActionUpdate:
+			if capability != domain.LifecycleCapabilityInstall {
+				base.Status = "denied"
+				base.Error = &domain.PluginBridgeSafeError{Code: "capability_denied", Message: "lifecycle action must match requested capability"}
+				return base
+			}
+			result, err = svc.UpdateServerGameForSession(sessionID, command)
 		}
 		if err != nil {
 			return bridgeExecutionError(base, err)