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.test.ts

@@ -1,5 +1,6 @@
 import { afterEach, describe, expect, it, vi } from 'vitest';
 import {
+  connectSecurityEventTransmitter,
   deleteOIDCBrowserSession,
   GatewayApiError,
   gatewayErrorMessage,
@@ -34,6 +35,29 @@ describe('Gateway provisioning errors', () => {
   });
 });
 
+describe('security event connection transport', () => {
+  afterEach(() => {
+    vi.unstubAllGlobals();
+  });
+
+  it('sends only the public transmitter issuer and concurrency headers', async () => {
+    const fetchMock = vi.fn().mockResolvedValue(new Response(JSON.stringify({ connected: true }), {
+      status: 202,
+      headers: { 'Content-Type': 'application/json' },
+    }));
+    vi.stubGlobal('fetch', fetchMock);
+    vi.stubGlobal('crypto', { randomUUID: () => '00000000-0000-4000-8000-000000000000' });
+
+    await connectSecurityEventTransmitter('manager-token', 'https://auth.example/ssf');
+
+    const [, init] = fetchMock.mock.calls[0] as [string, RequestInit];
+    expect(init.method).toBe('PUT');
+    expect(JSON.parse(String(init.body))).toEqual({ transmitter_issuer: 'https://auth.example/ssf' });
+    expect(String(init.body)).not.toMatch(/secret|bearer|scope|credential/i);
+    expect(new Headers(init.headers).get('Idempotency-Key')).toContain('ssf-connect-');
+  });
+});
+
 describe('OIDC browser session transport', () => {
   afterEach(() => {
     vi.unstubAllGlobals();