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/api.ts

@@ -43,6 +43,7 @@ import type {
   RateLimitWindow,
   RuntimePolicySet,
   RuntimePolicySetUpsertRequest,
+  SecurityEventConnectionResponse,
   UserGroup,
   UserGroupUpsertRequest,
   WalletAdjustmentResponse,
@@ -1000,6 +1001,40 @@ export async function updateClientCustomizationSettings(
   });
 }
 
+const securityEventConnectionPath = '/api/admin/system/identity/security-events/connection';
+
+export async function getSecurityEventConnection(token: string): Promise<SecurityEventConnectionResponse> {
+  return request<SecurityEventConnectionResponse>(securityEventConnectionPath, { token });
+}
+
+export async function connectSecurityEventTransmitter(token: string, transmitterIssuer: string): Promise<SecurityEventConnectionResponse> {
+  return request<SecurityEventConnectionResponse>(securityEventConnectionPath, {
+    body: { transmitter_issuer: transmitterIssuer }, method: 'PUT', token,
+    headers: { 'Idempotency-Key': `ssf-connect-${crypto.randomUUID()}` },
+  });
+}
+
+export async function verifySecurityEventConnection(token: string, version: number): Promise<SecurityEventConnectionResponse> {
+  return securityEventConnectionWrite(token, '/verify', version, 'POST', 'verify');
+}
+
+export async function rotateSecurityEventConnectionCredential(token: string, version: number): Promise<SecurityEventConnectionResponse> {
+  return securityEventConnectionWrite(token, '/rotate-credential', version, 'POST', 'rotate');
+}
+
+export async function disconnectSecurityEventConnection(token: string, version: number): Promise<SecurityEventConnectionResponse> {
+  return securityEventConnectionWrite(token, '', version, 'DELETE', 'disconnect');
+}
+
+function securityEventConnectionWrite(token: string, suffix: string, version: number, method: string, action: string) {
+  return request<SecurityEventConnectionResponse>(securityEventConnectionPath + suffix, {
+    method, token, headers: {
+      'Idempotency-Key': `ssf-${action}-${crypto.randomUUID()}`,
+      'If-Match': `W/"${version}"`,
+    },
+  });
+}
+
 export async function getPublicClientCustomization(): Promise<ClientCustomizationSettings> {
   return request<ClientCustomizationSettings>('/api/v1/public/client-customization', { auth: false });
 }