Move Fail2Ban exceptions into central app.exceptions module

backend/tests/test_services/test_fail2ban_metadata_service.py

@@ -5,7 +5,7 @@ from __future__ import annotations
 from unittest.mock import AsyncMock, patch
 
 from app.services.fail2ban_metadata_service import Fail2BanMetadataService
-from app.utils.fail2ban_client import Fail2BanConnectionError
+from app.exceptions import Fail2BanConnectionError
 
 
 async def test_get_db_path_caches_result() -> None:

backend/tests/test_services/test_health_service.py

@@ -9,7 +9,7 @@ import pytest
 
 from app.models.server import ServerStatus
 from app.services import health_service
-from app.utils.fail2ban_client import Fail2BanConnectionError, Fail2BanProtocolError
+from app.exceptions import Fail2BanConnectionError, Fail2BanProtocolError
 
 # ---------------------------------------------------------------------------
 # Helpers

backend/tests/test_services/test_jail_service.py

@@ -13,7 +13,7 @@ from app.models.geo import GeoDetail, GeoInfo
 from app.models.jail import JailDetailResponse, JailListResponse
 from app.services import jail_service
 from app.services.jail_service import JailNotFoundError, JailOperationError
-from app.utils.fail2ban_client import Fail2BanConnectionError
+from app.exceptions import Fail2BanConnectionError
 
 # ---------------------------------------------------------------------------
 # Helpers