[rewrite] Added a config manager and some test code

backend/app/routes/shop_routes.py

@@ -0,0 +1,11 @@
+from fastapi import APIRouter
+
+router = APIRouter(
+    prefix="/shop",
+    tags=["Shop"]
+)
+
+
+@router.get("/")
+async def get_shop_info():
+    raise NotImplementedError