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

backend/app/services/server_service.py

@@ -14,6 +14,8 @@ from typing import cast
 
 import structlog
 
+from app.exceptions import ServerOperationError
+from app.exceptions import ServerOperationError
 from app.models.server import ServerSettings, ServerSettingsResponse, ServerSettingsUpdate
 from app.utils.fail2ban_client import Fail2BanClient, Fail2BanCommand, Fail2BanResponse
 
@@ -54,15 +56,6 @@ def _to_str(value: object | None, default: str) -> str:
     return str(value)
 
 
-# ---------------------------------------------------------------------------
-# Custom exceptions
-# ---------------------------------------------------------------------------
-
-
-class ServerOperationError(Exception):
-    """Raised when a server-level set command fails."""
-
-
 # ---------------------------------------------------------------------------
 # Internal helpers
 # ---------------------------------------------------------------------------