feat(stage-1): inactive jail discovery and activation

- Backend: config_file_service.py parses jail.conf/jail.local/jail.d/*
  following fail2ban merge order; discovers jails not running in fail2ban
- Backend: 3 new API endpoints (GET /jails/inactive, POST /jails/{name}/activate,
  POST /jails/{name}/deactivate); moved /jails/inactive before /jails/{name}
  to fix route-ordering conflict
- Frontend: ActivateJailDialog component with optional parameter overrides
- Frontend: JailsTab extended with inactive jail list and InactiveJailDetail pane
- Frontend: JailsPage JailOverviewSection shows inactive jails with toggle
- Tests: 57 service tests + 16 router tests for all new endpoints (all pass)
- Docs: Features.md, Architekture.md, Tasks.md updated; Tasks 1.1-1.5 marked done

frontend/src/components/config/index.ts

@@ -8,6 +8,8 @@
 export { ActionsTab } from "./ActionsTab";
 export { ActionForm } from "./ActionForm";
 export type { ActionFormProps } from "./ActionForm";
+export { ActivateJailDialog } from "./ActivateJailDialog";
+export type { ActivateJailDialogProps } from "./ActivateJailDialog";
 export { AutoSaveIndicator } from "./AutoSaveIndicator";
 export type { AutoSaveStatus, AutoSaveIndicatorProps } from "./AutoSaveIndicator";
 export { ConfFilesTab } from "./ConfFilesTab";