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

uni-app/src/App.vue

@@ -6,8 +6,12 @@
 </script>
 
 <style>
+/* #ifdef H5 */
 * { margin: 0; padding: 0; box-sizing: border-box; }
+/* #endif */
 html, body, #app { height: 100%; width: 100%; }
+/* #ifdef H5 */
 uni-page { overflow-y: auto !important; }
 uni-page-body { overflow-y: auto !important; min-height: 100% !important; }
+/* #endif */
 </style>