feat(admin): 审计 & 安全事件页（T4.B 收尾）

- 新增「审计 & 安全」页(/audit，运维组)：接 /admin/audit + /admin/guardrail-events
  - 安全事件：护栏拦截/灰区放行(kind 徽标 + 原因 + method/path + actor/ip/时间)
  - 操作审计：变更操作(方法配色徽标 + 路径 + 状态码着色 + actor/ip/时间)
  - 顶栏统计(操作留痕/护栏拦截/灰区) + 30s 自刷 + 手动刷新
- api.ts 增 listAudit / listGuardrailEvents + 类型
- 风格对齐重做后的服务状态页(中性克制)
- T4.B 整组完成(剩 HITL 审批明细可选小项)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

sundynix-admin/src/routes.tsx

@@ -14,6 +14,7 @@ const EvalsPage = lazy(() => import("./pages/EvalsPage").then((m) => ({ default:
 const TenantsPage = lazy(() => import("./pages/TenantsPage").then((m) => ({ default: m.TenantsPage })));
 const GuardrailsPage = lazy(() => import("./pages/GuardrailsPage").then((m) => ({ default: m.GuardrailsPage })));
 const PromptsPage = lazy(() => import("./pages/PromptsPage").then((m) => ({ default: m.PromptsPage })));
+const AuditPage = lazy(() => import("./pages/AuditPage").then((m) => ({ default: m.AuditPage })));
 
 export interface RouteDef {
   path: string;
@@ -73,6 +74,13 @@ export const routes: RouteDef[] = [
     ready: true,
     element: <EvalsPage />,
   },
+  {
+    path: "/audit",
+    label: "审计 & 安全",
+    group: "运维",
+    ready: true,
+    element: <AuditPage />,
+  },
   {
     path: "/tenants",
     label: "租户 & 用户",