refactor: improve code formatting and organization across multiple files

backend/app/repositories/stations.py

@@ -1,13 +1,12 @@
 from __future__ import annotations
 
 import sqlalchemy as sa
+from geoalchemy2.elements import WKTElement
 from sqlalchemy.orm import Session
 
-from geoalchemy2.elements import WKTElement
-
 from backend.app.db.models import Station
-from backend.app.repositories.base import BaseRepository
 from backend.app.models import StationCreate
+from backend.app.repositories.base import BaseRepository
 
 
 class StationRepository(BaseRepository[Station]):