Linted and formatted all files

app/routers/auth.py

@@ -1,16 +1,16 @@
 from fastapi import APIRouter
+
 from app.auth.cognito import initiate_auth
 from app.models.auth import SigninRequest, TokenResponse
 
-router = APIRouter(
-    prefix="/auth",
-    tags=["authentication"]
-)
+router = APIRouter(prefix="/auth", tags=["authentication"])
+
 
 @router.post("/signin", response_model=TokenResponse, summary="Signin Endpoint")
 def signin(credentials: SigninRequest):
     """
-    Sign-in endpoint to authenticate the user with AWS Cognito using username and password.
+    Sign-in endpoint to authenticate the user with AWS Cognito
+    using username and password.
     On success, returns JWT tokens (access_token, id_token, refresh_token).
     """
     auth_result = initiate_auth(credentials.username, credentials.password)
@@ -19,4 +19,4 @@ def signin(credentials: SigninRequest):
         id_token=auth_result["IdToken"],
         refresh_token=auth_result.get("RefreshToken"),
         token_type="Bearer",
-    )
+    )