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/api/config.ts

@@ -7,6 +7,7 @@ import { ENDPOINTS } from "./endpoints";
 import type {
   ActionConfig,
   ActionConfigUpdate,
+  ActivateJailRequest,
   AddLogPathRequest,
   ConfFileContent,
   ConfFileCreateRequest,
@@ -16,6 +17,8 @@ import type {
   FilterConfigUpdate,
   GlobalConfig,
   GlobalConfigUpdate,
+  InactiveJailListResponse,
+  JailActivationResponse,
   JailConfigFileContent,
   JailConfigFileEnabledUpdate,
   JailConfigFilesResponse,
@@ -290,3 +293,38 @@ export async function updateParsedJailFile(
 ): Promise<void> {
   await put<undefined>(ENDPOINTS.configJailFileParsed(filename), update);
 }
+
+// ---------------------------------------------------------------------------
+// Inactive jails (Stage 1)
+// ---------------------------------------------------------------------------
+
+/** Fetch all inactive jails from config files. */
+export async function fetchInactiveJails(): Promise<InactiveJailListResponse> {
+  return get<InactiveJailListResponse>(ENDPOINTS.configJailsInactive);
+}
+
+/**
+ * Activate an inactive jail, optionally providing override values.
+ *
+ * @param name - The jail name.
+ * @param overrides - Optional parameter overrides (bantime, findtime, etc.).
+ */
+export async function activateJail(
+  name: string,
+  overrides?: ActivateJailRequest
+): Promise<JailActivationResponse> {
+  return post<JailActivationResponse>(
+    ENDPOINTS.configJailActivate(name),
+    overrides ?? {}
+  );
+}
+
+/** Deactivate an active jail. */
+export async function deactivateJail(
+  name: string
+): Promise<JailActivationResponse> {
+  return post<JailActivationResponse>(
+    ENDPOINTS.configJailDeactivate(name),
+    undefined
+  );
+}