feat(fetcher): add data fetcher

app/router/fetcher.py

@@ -0,0 +1,14 @@
+from __future__ import annotations
+
+from app.dependencies.fetcher import get_fetcher
+from app.fetcher import Fetcher
+
+from fastapi import APIRouter, Depends
+
+fetcher_router = APIRouter()
+
+
+@fetcher_router.get("/callback")
+async def callback(code: str, fetcher: Fetcher = Depends(get_fetcher)):
+    await fetcher.grant_access_token(code)
+    return {"message": "Login successful"}