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/health_service.py

@@ -18,6 +18,7 @@ import structlog
 from app import __version__
 from app.models.config import ServiceStatusResponse
 from app.models.server import ServerStatus
+from app.utils.constants import FAIL2BAN_SOCKET_TIMEOUT_FAST
 from app.utils.fail2ban_client import (
     Fail2BanClient,
     Fail2BanCommand,
@@ -35,8 +36,6 @@ log: structlog.stdlib.BoundLogger = structlog.get_logger()
 # Internal helpers
 # ---------------------------------------------------------------------------
 
-_SOCKET_TIMEOUT: float = 5.0
-
 
 T = TypeVar("T")
 
@@ -93,7 +92,7 @@ async def get_service_status(
     if server_status.online:
         client = Fail2BanClient(
             socket_path=socket_path,
-            timeout=_SOCKET_TIMEOUT,
+            timeout=FAIL2BAN_SOCKET_TIMEOUT_FAST,
         )
         log_level_raw, log_target_raw = await asyncio.gather(
             _safe_get_typed(client, ["get", "loglevel"], "INFO"),
@@ -129,7 +128,7 @@ async def get_service_status(
 
 async def probe(
     socket_path: str,
-    timeout: float = _SOCKET_TIMEOUT,
+    timeout: float = FAIL2BAN_SOCKET_TIMEOUT_FAST,
 ) -> ServerStatus:
     """Probe the fail2ban daemon and return a
     :class:`~app.models.server.ServerStatus`.