Adapt deployment for Dokploy

Replace the Gitea Actions SSH deploy with a Docker image
(serversideup/php fpm-nginx) and docker-compose setup. Store the
SQLite database inside the persistent storage volume, trust the
reverse proxy, and move admin credentials into config so they work
with cached configuration.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

bootstrap/app.php

@@ -12,6 +12,9 @@ return Application::configure(basePath: dirname(__DIR__))
         health: '/up',
     )
     ->withMiddleware(function (Middleware $middleware): void {
+        // Dokploy (Traefik) терминирует TLS и проксирует запросы в контейнер
+        $middleware->trustProxies(at: '*');
+
         $middleware->alias([
             'file.upload.basic' => \App\Http\Middleware\EnsureFileUploadBasicAuth::class,
         ]);