fix: resolve known issues and improve code standards

- Fix known bugs in user, plan, and server modules
- Standardize code formatting and structure
- Optimize database queries and model relationships
- Improve request validation and error handling
- Update admin controllers for better consistency

app/Providers/SettingServiceProvider.php

@@ -16,7 +16,7 @@ class SettingServiceProvider extends ServiceProvider
     public function register()
     {
         $this->app->scoped(Setting::class, function (Application $app) {
-            return new Setting();
+            return Setting::getInstance();
         });
 
     }