feat: AI routing DB-driven, payment gateway full integration, WeChat mini-program CI/CD

- AI routing rules now stored in system_configs DB table instead of hardcoded config
- Multi-model support via name|model composite key for same-provider routing
- UnifiedPayService with HMAC-SHA256 gateway integration (alipay/wechat)
- Admin payment panel: list, stats, search, filter, refund
- WeChat mini-program CI/CD via miniprogram-ci (v1.0.9)
- Translation quota extended to LLM provider tier
- SearchService with DB-driven provider config (bing/google_cse/searxng)
- Footer cleanup across admin/workspace/uni-app
- Private key excluded from git tracking

admin-frontend/src/router/index.js

@@ -36,6 +36,14 @@ const routes = [
       { path: '', name: 'Logs', component: () => import('@/views/Logs.vue'), meta: { title: '日志' } },
     ]
   },
+  {
+    path: '/payments',
+    component: AdminLayout,
+    meta: { requiresAuth: true },
+    children: [
+      { path: '', name: 'Payments', component: () => import('@/views/Payments.vue'), meta: { title: '支付管理' } },
+    ]
+  },
   {
     path: '/config',
     component: AdminLayout,