Refactor backend services and utilities

- Update service layer implementations
- Improve configuration handling utilities
- Update documentation tasks

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

backend/app/services/fail2ban_metadata_service.py

@@ -6,6 +6,7 @@ import asyncio
 
 import structlog
 
+from app.utils.constants import FAIL2BAN_SOCKET_TIMEOUT_FAST
 from app.utils.fail2ban_client import (
     Fail2BanClient,
     Fail2BanConnectionError,
@@ -64,8 +65,7 @@ class Fail2BanMetadataService:
 
     async def _resolve_db_path(self, socket_path: str) -> str:
         """Query fail2ban for the configured database path."""
-        socket_timeout: float = 5.0
-        async with Fail2BanClient(socket_path, timeout=socket_timeout) as client:
+        async with Fail2BanClient(socket_path, timeout=FAIL2BAN_SOCKET_TIMEOUT_FAST) as client:
             response = await client.send(["get", "dbfile"])
 
         if not isinstance(response, tuple) or len(response) != 2: