Fix: Add routes and admin navigation

- Created appinfo/routes.php to register all routes
  - Admin routes: index, save, load, getStatus
  - API v1 routes: reports, getReport, generate, getStatus
  - Report routes: index, generate
- Added index() method to AdminController
  - Renders admin template via TemplateResponse
- Updated info.xml and appinfo/info.xml
  - Fixed navigation entry to point to route: analyticshub.admin.index
  - Added settings and navigation sections
- App now appears in Settings → Administration after enable/disable

Fixes issue where app didn't show up in Nextcloud toolbar after being enabled.

analyticshub/lib/Controller/AdminController.php

@@ -9,6 +9,7 @@ use OCP\IResponse;
 use OCP\AppFramework\Http;
 use OCP\AppFramework\Http\DataResponse;
 use OCP\AppFramework\Http\JSONResponse;
+use OCP\AppFramework\Http\TemplateResponse;
 
 use OCA\AnalyticsHub\Service\GoogleAnalyticsService;
 use OCA\AnalyticsHub\Service\LLMService;
@@ -34,9 +35,21 @@ class AdminController {
         $this->dataProcessor = $dataProcessor;
     }
 
+    /**
+     * Index page - render admin UI
+     * GET /admin
+     */
+    public function index(): TemplateResponse {
+        return new TemplateResponse('analyticshub', 'admin', [
+            'app_name' => AppInfo::APP_NAME,
+            'version' => AppInfo::getVersion(),
+            'status' => $this->gaService->isConfigured() ? 'configured' : 'not_configured',
+        ]);
+    }
+
     /**
      * Save configuration
-     * POST /settings/save
+     * POST /admin/save
      */
     public function save(IRequest $request): JSONResponse {
         $params = $request->getParams();