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

backend/app/api/v1/admin.py

@@ -283,12 +283,13 @@ async def admin_list_payments(
     size: int = Query(20, ge=1, le=100),
     gateway: str = Query(default=""),
     status: str = Query(default=""),
+    pay_type: str = Query(default=""),
     user_id: str = Query(default=""),
     _: dict = Depends(require_admin),
     db: AsyncSession = Depends(get_db),
 ):
     svc = PaymentService(db)
-    return await svc.admin_list_payments(page, size, gateway, status, user_id)
+    return await svc.admin_list_payments(page, size, gateway, status, user_id, pay_type)
 
 
 @router.get("/payments/stats")
@@ -313,3 +314,30 @@ async def admin_refund(
         return await svc.admin_refund(order_no, reason)
     except ValueError as e:
         raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.post("/payments/close")
+async def admin_close_order(
+    data: dict,
+    _: dict = Depends(require_admin),
+    db: AsyncSession = Depends(get_db),
+):
+    order_no = data.get("order_no", "")
+    svc = PaymentService(db)
+    try:
+        return await svc.admin_close_order(order_no)
+    except ValueError as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.get("/payments/query-refund/{order_no}")
+async def admin_query_refund(
+    order_no: str,
+    _: dict = Depends(require_admin),
+    db: AsyncSession = Depends(get_db),
+):
+    svc = PaymentService(db)
+    try:
+        return await svc.query_refund(order_no)
+    except ValueError as e:
+        raise HTTPException(status_code=404, detail=str(e))