feat(ssf): 实现安全事件一键连接与凭据托管

新增数据库驱动的 SecurityEventConnectionManager，复用 RFC 7662 机器 Client，自动完成 Discovery、Push Bearer 生成、Stream 创建、Verification、首次启用、零停机轮换和安全退役。

增加文件与 Kubernetes SecretStore、最小权限 RBAC、动态 Receiver/撤销水位/内省降级，以及系统设置管理页面。已通过全量 Go 测试、go vet、关键包竞态测试、27 个 Web 测试、类型检查、生产构建、Compose 和 Kubernetes dry-run。

apps/web/src/pages/AdminPage.tsx

@@ -82,6 +82,11 @@ export function AdminPage(props: {
   onSaveClientCustomizationSettings: (input: ClientCustomizationSettingsUpdateRequest) => Promise<void>;
   onSaveFileStorageChannel: (input: FileStorageChannelUpsertRequest, channelId?: string) => Promise<void>;
   onSaveFileStorageSettings: (input: FileStorageSettingsUpdateRequest) => Promise<void>;
+  onConnectSecurityEvents: (transmitterIssuer: string) => Promise<void>;
+  onDisconnectSecurityEvents: () => Promise<void>;
+  onRefreshSecurityEvents: () => Promise<void>;
+  onRotateSecurityEventsCredential: () => Promise<void>;
+  onVerifySecurityEvents: () => Promise<void>;
   onSaveTenant: (input: GatewayTenantUpsertRequest, tenantId?: string) => Promise<void>;
   onSaveUser: (input: GatewayUserUpsertRequest, userId?: string) => Promise<void>;
   onRechargeUserWalletBalance: (userId: string, input: WalletRechargeRequest) => Promise<void>;
@@ -189,12 +194,18 @@ export function AdminPage(props: {
               channels={props.data.fileStorageChannels}
               clientCustomizationSettings={props.data.clientCustomizationSettings}
               settings={props.data.fileStorageSettings}
+              securityEventConnection={props.data.securityEventConnection}
               message={props.operationMessage}
               state={props.state}
               onDeleteFileStorageChannel={props.onDeleteFileStorageChannel}
               onSaveFileStorageChannel={props.onSaveFileStorageChannel}
               onSaveFileStorageSettings={props.onSaveFileStorageSettings}
               onSaveClientCustomizationSettings={props.onSaveClientCustomizationSettings}
+              onConnectSecurityEvents={props.onConnectSecurityEvents}
+              onDisconnectSecurityEvents={props.onDisconnectSecurityEvents}
+              onRefreshSecurityEvents={props.onRefreshSecurityEvents}
+              onRotateSecurityEventsCredential={props.onRotateSecurityEventsCredential}
+              onVerifySecurityEvents={props.onVerifySecurityEvents}
             />
           )}
         </div>