feat: Implement client authentication and pre-fill functionality

- Added AuthController for client login and token management.
- Introduced AuthGate for handling authentication state and login UI.
- Updated API to support fetching client data for pre-filling forms.
- Modified App.vue to pre-fill client information if logged in.
- Enhanced client model to include username and password fields.
- Created migration for adding username and password to clients table.
- Added utility for generating secure usernames and passwords.
- Updated frontend to handle client tokens for pre-filling checkout forms.
- Removed old CSS file and updated HTML references to new assets.
- Added StatsOverview widget for displaying client and quote statistics.
- Improved error handling and user feedback in the login process.

backoffice/app/Providers/Filament/AdminPanelProvider.php

@@ -10,7 +10,6 @@ use Filament\Pages;
 use Filament\Panel;
 use Filament\PanelProvider;
 use Filament\Support\Colors\Color;
-use Filament\Widgets;
 use Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse;
 use Illuminate\Cookie\Middleware\EncryptCookies;
 use Illuminate\Foundation\Http\Middleware\VerifyCsrfToken;
@@ -41,10 +40,7 @@ class AdminPanelProvider extends PanelProvider
                 Pages\Dashboard::class,
             ])
             ->discoverWidgets(in: app_path('Filament/Widgets'), for: 'App\\Filament\\Widgets')
-            ->widgets([
-                Widgets\AccountWidget::class,
-                Widgets\FilamentInfoWidget::class,
-            ])
+            ->widgets([])
             ->middleware([
                 EncryptCookies::class,
                 AddQueuedCookiesToResponse::class,