feat: 新增管理后台前端项目及安全加固

refactor(saas): 重构认证中间件与限流策略
- 登录限流调整为5次/分钟/IP
- 注册限流调整为3次/小时/IP
- GET请求不计入限流

fix(saas): 修复调度器时间戳处理
- 使用NOW()替代文本时间戳
- 兼容TEXT和TIMESTAMPTZ列类型

feat(saas): 实现环境变量插值
- 支持${ENV_VAR}语法解析
- 数据库密码支持环境变量注入

chore: 新增前端管理界面
- 基于React+Ant Design Pro
- 包含路由守卫/错误边界
- 对接58个API端点

docs: 更新安全加固文档
- 新增密钥管理规范
- 记录P0安全项审计结果
- 补充TLS终止说明

test: 完善配置解析单元测试
- 新增环境变量插值测试用例

admin-temp-dir/src/router/index.tsx

@@ -0,0 +1,35 @@
+// ============================================================
+// 路由定义
+// ============================================================
+
+import { createBrowserRouter } from 'react-router-dom'
+import { AuthGuard } from './AuthGuard'
+import AdminLayout from '@/layouts/AdminLayout'
+
+export const router = createBrowserRouter([
+  {
+    path: '/login',
+    lazy: () => import('@/pages/Login').then((m) => ({ Component: m.default })),
+  },
+  {
+    path: '/',
+    element: (
+      <AuthGuard>
+        <AdminLayout />
+      </AuthGuard>
+    ),
+    children: [
+      { index: true, lazy: () => import('@/pages/Dashboard').then((m) => ({ Component: m.default })) },
+      { path: 'accounts', lazy: () => import('@/pages/Accounts').then((m) => ({ Component: m.default })) },
+      { path: 'providers', lazy: () => import('@/pages/Providers').then((m) => ({ Component: m.default })) },
+      { path: 'models', lazy: () => import('@/pages/Models').then((m) => ({ Component: m.default })) },
+      { path: 'agent-templates', lazy: () => import('@/pages/AgentTemplates').then((m) => ({ Component: m.default })) },
+      { path: 'api-keys', lazy: () => import('@/pages/ApiKeys').then((m) => ({ Component: m.default })) },
+      { path: 'usage', lazy: () => import('@/pages/Usage').then((m) => ({ Component: m.default })) },
+      { path: 'relay', lazy: () => import('@/pages/Relay').then((m) => ({ Component: m.default })) },
+      { path: 'config', lazy: () => import('@/pages/Config').then((m) => ({ Component: m.default })) },
+      { path: 'prompts', lazy: () => import('@/pages/Prompts').then((m) => ({ Component: m.default })) },
+      { path: 'logs', lazy: () => import('@/pages/Logs').then((m) => ({ Component: m.default })) },
+    ],
+  },
+])