HOTFIX: Fix broken imports in get_organization_details

- from app.models.fleet.vehicle → app.models.vehicle.vehicle (Vehicle)
- from app.models.fleet.organization → app.models.marketplace.organization (Branch)

These modules don't exist under app.models.fleet, causing
ModuleNotFoundError on GET /api/v1/admin/organizations/45/details

backend/app/api/v1/endpoints/admin_organizations.py

@@ -514,7 +514,7 @@ async def get_organization_details(
     active_subs = sub_result.scalars().all()
 
     # 2b. P0 ADD-ON: Valós járműszám lekérése a fleet táblából
-    from app.models.fleet.vehicle import Vehicle  # noqa: E402
+    from app.models.vehicle.vehicle import Vehicle  # noqa: E402
     vehicle_count_stmt = select(func.count(Vehicle.id)).where(
         Vehicle.organization_id == org_id,
         Vehicle.is_deleted == False,
@@ -523,7 +523,7 @@ async def get_organization_details(
     asset_count = vehicle_count_result.scalar() or 0
 
     # 2c. P0 ADD-ON: Telephelyek (branches) lekérése
-    from app.models.fleet.organization import Branch  # noqa: E402
+    from app.models.marketplace.organization import Branch  # noqa: E402
     branches_stmt = select(Branch).where(
         Branch.organization_id == org_id,
         Branch.is_deleted == False,