refactor: complete Task 2/3 geo decouple + exceptions centralization; mark as done

backend/tests/test_routers/test_geo.py

@@ -12,7 +12,7 @@ from httpx import ASGITransport, AsyncClient
 from app.config import Settings
 from app.db import init_db
 from app.main import create_app
-from app.services.geo_service import GeoInfo
+from app.models.geo import GeoInfo
 
 # ---------------------------------------------------------------------------
 # Fixtures