Refactor authentication routes to use '/auth' prefix in API calls

backend/tests/test_reward_api.py

@@ -28,7 +28,7 @@ def add_test_user():
     })
 
 def login_and_set_cookie(client):
-    resp = client.post('/login', json={"email": TEST_EMAIL, "password": TEST_PASSWORD})
+    resp = client.post('/auth/login', json={"email": TEST_EMAIL, "password": TEST_PASSWORD})
     assert resp.status_code == 200
     token = resp.headers.get("Set-Cookie")
     assert token and "token=" in token
@@ -37,7 +37,7 @@ def login_and_set_cookie(client):
 def client():
     app = Flask(__name__)
     app.register_blueprint(reward_api)
-    app.register_blueprint(auth_api)
+    app.register_blueprint(auth_api, url_prefix='/auth')
     app.config['TESTING'] = True
     app.config['SECRET_KEY'] = 'supersecretkey'
     with app.test_client() as client: