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/log_service.py

@@ -21,6 +21,7 @@ from app.models.config import (
     RegexTestResponse,
 )
 from app.utils.async_utils import run_blocking
+from app.utils.constants import FAIL2BAN_SOCKET_TIMEOUT
 from app.utils.fail2ban_client import (
     Fail2BanClient,
     Fail2BanConnectionError,
@@ -30,8 +31,6 @@ from app.utils.fail2ban_response import ok
 
 log: structlog.stdlib.BoundLogger = structlog.get_logger()
 
-_SOCKET_TIMEOUT: float = 10.0
-
 _NON_FILE_LOG_TARGETS: frozenset[str] = frozenset(
     {"STDOUT", "STDERR", "SYSLOG", "SYSTEMD-JOURNAL"}
 )
@@ -85,7 +84,7 @@ async def read_fail2ban_log(
     validates that the target is a readable file, then returns the last
     *lines* entries optionally filtered by *filter_text*.
     """
-    client = Fail2BanClient(socket_path=socket_path, timeout=_SOCKET_TIMEOUT)
+    client = Fail2BanClient(socket_path=socket_path, timeout=FAIL2BAN_SOCKET_TIMEOUT)
 
     log_level_raw, log_target_raw = await asyncio.gather(
         _safe_get_typed(client, ["get", "loglevel"], "INFO"),