feat: max-bot-test initial — full surface coverage

- Slim 4 PSR-15 webhook, PHP-DI 7, Symfony Console 8
- 13 update handlers, 30+ command scenarios, all 7 button types
- Composer pulls pkirillw/max-bot-api-php from GitHub vcs
- Multi-stage Dockerfile (php-fpm 8.4-alpine) + nginx
- docker-compose.yml targets server (npm_default external)
- docker-compose.override.yml for local dev (gitignored)
- .gitea/workflows/deploy.yml mirrors ghost-blog-bot pattern

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

config/routes.php

@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+use Nyholm\Psr7\Factory\Psr17Factory;
+use Pkirillw\MaxBotApi\Webhook\WebhookHandler;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Slim\App;
+
+return static function (App $app): void {
+    $app->post('/webhook', WebhookHandler::class);
+
+    $app->get('/health', function (ServerRequestInterface $request, ResponseInterface $response): ResponseInterface {
+        $payload = json_encode(['ok' => true, 'time' => date('c')], JSON_UNESCAPED_UNICODE);
+        $response->getBody()->write((string) $payload);
+        return $response->withHeader('Content-Type', 'application/json');
+    });
+};