Fix: Add proper Application.php and fix DI

- Created appinfo/Application.php (Nextcloud app bootstrap)
  - Extends OCP\AppFramework\App
  - Registers proper app ID: analyticshub
  - Loads CSS and JS files
- Removed obsolete lib/App.php file
- Updated all AppInfo::APP_NAME references to Application::APP_NAME
  - AdminController, ApiV1Controller
  - GoogleAnalyticsService, LLMService
- Fixed dependency injection in AdminController
  - Injected IConfig service properly
- Added missing use statements

This is the core fix for the app not appearing in Nextcloud.
Nextcloud requires appinfo/Application.php to initialize the app.

analyticshub/lib/Controller/AdminController.php

@@ -10,10 +10,12 @@ use OCP\AppFramework\Http;
 use OCP\AppFramework\Http\DataResponse;
 use OCP\AppFramework\Http\JSONResponse;
 use OCP\AppFramework\Http\TemplateResponse;
+use OCA\AnalyticsHub\AppInfo\Application;
 
 use OCA\AnalyticsHub\Service\GoogleAnalyticsService;
 use OCA\AnalyticsHub\Service\LLMService;
 use OCA\AnalyticsHub\Service\DataProcessor;
+use OCP\IConfig;
 
 /**
  * Admin Settings Controller
@@ -21,15 +23,18 @@ use OCA\AnalyticsHub\Service\DataProcessor;
  */
 class AdminController {
 
+    private IConfig $config;
     private GoogleAnalyticsService $gaService;
     private LLMService $llmService;
     private DataProcessor $dataProcessor;
 
     public function __construct(
+        IConfig $config,
         GoogleAnalyticsService $gaService,
         LLMService $llmService,
         DataProcessor $dataProcessor
     ) {
+        $this->config = $config;
         $this->gaService = $gaService;
         $this->llmService = $llmService;
         $this->dataProcessor = $dataProcessor;
@@ -41,7 +46,7 @@ class AdminController {
      */
     public function index(): TemplateResponse {
         return new TemplateResponse('analyticshub', 'admin', [
-            'app_name' => AppInfo::APP_NAME,
+            'app_name' => Application::APP_NAME,
             'version' => AppInfo::getVersion(),
             'status' => $this->gaService->isConfigured() ? 'configured' : 'not_configured',
         ]);
@@ -145,7 +150,7 @@ class AdminController {
      */
     public function getStatus(IRequest $request): DataResponse {
         $status = [
-            'app_name' => AppInfo::APP_NAME,
+            'app_name' => Application::APP_NAME,
             'version' => AppInfo::getVersion(),
             'status' => 'operational',
             'google_analytics' => $this->gaService->isConfigured() ? 'configured' : 'not_configured',
@@ -164,10 +169,10 @@ class AdminController {
      * Helper methods
      */
     private function saveConfigValue(string $key, string $value): void {
-        $this->getConfig()->setAppValue($key, $value, AppInfo::APP_NAME);
+        $this->config->setAppValue(Application::APP_NAME, $key, $value);
     }
 
     private function getConfigValue(string $key): ?string {
-        return $this->getConfig()->getAppValue($key, AppInfo::APP_NAME);
+        return $this->config->getAppValue(Application::APP_NAME, $key);
     }
 }