Refactor backend services and jail configuration

- Refactor action_config_service, filter_config_service, jail_config_service, and jail_service
- Add jail_socket utility module for socket communication
- Update test_jail_service with new test cases
- Update architecture and task documentation

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

backend/app/services/jail_config_service.py

@@ -25,17 +25,6 @@ from app.exceptions import (
     JailNotFoundError,
     JailNotFoundInConfigError,
 )
-import app.services.jail_service as jail_service
-from app.utils.config_file_utils import (
-    _build_inactive_jail,
-    _parse_jails_sync as _config_file_parse_jails_sync,
-    _get_active_jail_names as _config_file_get_active_jail_names,
-    _probe_fail2ban_running,
-    _safe_jail_name,
-    _validate_jail_config_sync as _config_file_validate_jail_config_sync,
-    start_daemon,
-    wait_for_fail2ban,
-)
 from app.models.config import (
     ActivateJailRequest,
     InactiveJail,
@@ -46,7 +35,23 @@ from app.models.config import (
 )
 from app.services import health_service
 from app.utils.async_utils import run_blocking
-from app.utils.fail2ban_client import Fail2BanClient
+from app.utils.config_file_utils import (
+    _build_inactive_jail,
+    _probe_fail2ban_running,
+    _safe_jail_name,
+    start_daemon,
+    wait_for_fail2ban,
+)
+from app.utils.config_file_utils import (
+    _get_active_jail_names as _config_file_get_active_jail_names,
+)
+from app.utils.config_file_utils import (
+    _parse_jails_sync as _config_file_parse_jails_sync,
+)
+from app.utils.config_file_utils import (
+    _validate_jail_config_sync as _config_file_validate_jail_config_sync,
+)
+from app.utils.jail_socket import reload_all
 
 log: structlog.stdlib.BoundLogger = structlog.get_logger()
 
@@ -404,7 +409,7 @@ async def _activate_jail(
     # Activation reload — if it fails, roll back immediately                  #
     # ---------------------------------------------------------------------- #
     try:
-        await jail_service.reload_all(socket_path, include_jails=[name])
+        await reload_all(socket_path, include_jails=[name])
     except JailNotFoundError as exc:
         # Jail configuration is invalid (e.g. missing logpath that prevents
         # fail2ban from loading the jail). Roll back and provide a specific error.
@@ -546,7 +551,7 @@ async def _rollback_activation_async(
 
     # Step 2 — reload fail2ban with the restored config.
     try:
-        await jail_service.reload_all(socket_path)
+        await reload_all(socket_path)
         log.info("jail_activation_rollback_reload_ok", jail=name)
     except Exception as exc:  # noqa: BLE001
         log.warning("jail_activation_rollback_reload_failed", jail=name, error=str(exc))
@@ -626,7 +631,7 @@ async def _deactivate_jail(
     )
 
     try:
-        await jail_service.reload_all(socket_path, exclude_jails=[name])
+        await reload_all(socket_path, exclude_jails=[name])
     except Exception as exc:  # noqa: BLE001
         log.warning("reload_after_deactivate_failed", jail=name, error=str(exc))