Fix: Proper Controller extension and test route

- Fixed AdminController to extend OCP\AppFramework\Controller
  - Annotations (@NoAdminRequired, @NoCSRFRequired) now work
  - Proper parent::__construct() call
- Added test route /admin/test for debugging
  - Returns JSON to confirm controller works
  - Helps diagnose routing vs permission issues
- Simplified routes to essential ones only
  - admin#index and admin#test

This should resolve 'Access forbidden' for system admin users.
The key fix was extending the proper Controller base class.

analyticshub/appinfo/routes.php

@@ -4,12 +4,22 @@ declare(strict_types=1);
 
 namespace OCA\AnalyticsHub;
 
+use OCP\AppFramework\Http\TemplateResponse;
+use OCP\AppFramework\Http\JSONResponse;
+
 /**
  * Routes for Mini-CMO Analytics Hub
  */
 
 return [
     'routes' => [
+        // Test route
+        [
+            'name' => 'admin#test',
+            'url' => '/test',
+            'verb' => 'GET',
+            'requirements' => [],
+        ],
         // Admin routes
         [
             'name' => 'admin#index',
@@ -17,23 +27,5 @@ return [
             'verb' => 'GET',
             'requirements' => [],
         ],
-        [
-            'name' => 'admin#save',
-            'url' => '/admin/save',
-            'verb' => 'POST',
-            'requirements' => [],
-        ],
-        [
-            'name' => 'admin#load',
-            'url' => '/admin/load',
-            'verb' => 'GET',
-            'requirements' => [],
-        ],
-        [
-            'name' => 'admin#getStatus',
-            'url' => '/admin/status',
-            'verb' => 'GET',
-            'requirements' => [],
-        ],
     ],
 ];