Add PHP Media API scaffold and Docker configs

Initial project scaffold for a PHP Media API including routing, controllers, models and services under api/ (Router, Media/Cast/Image/Settings controllers, models, database/bootstrap files and automatic docs service). Adds Docker support (Dockerfile, docker-compose.yml, DOCKER_README.md, php-custom.ini), .htaccess for pretty URLs, API documentation and example payloads (API_EXAMPLES.md, api/README.md, api_examples/*.json), image handling service and logging, plus a comprehensive .gitignore. This commit provides a runnable development environment and example requests to get the API up and tested quickly.

api/config.php

@@ -0,0 +1,39 @@
+<?php
+// Konfiguration
+// Docker-Umgebungsvariablen oder Standardwerte
+define('DB_HOST', getenv('DB_HOST') ?: 'mariadb');
+define('DB_NAME', getenv('DB_NAME') ?: 'kyoo');
+define('DB_USER', getenv('DB_USER') ?: 'kyoo_user');
+define('DB_PASS', getenv('DB_PASS') ?: 'kyoo_password');
+define('API_BASE', '/api');
+
+// API Logging Konfiguration
+define('API_LOGGING_ENABLED', getenv('API_LOGGING_ENABLED') === 'true' || false); // Standardmäßig aktiviert zum Testen
+define('API_LOG_FILE', '/var/www/html/logs/api.log');
+
+// PHP Error Logging Konfiguration
+define('PHP_ERROR_LOG_FILE', '/var/www/html/logs/php_error.log');
+
+// Hilfsfunktion für cleanname Generierung
+function generateCleanName($name) {
+    // Kleinbuchstaben, nur alphanumerische Zeichen und Bindestriche
+    $clean = strtolower($name);
+    // Sonderzeichen durch Bindestriche ersetzen
+    $clean = preg_replace('/[^a-z0-9]+/', '-', $clean);
+    // Bindestriche am Anfang und Ende entfernen
+    $clean = trim($clean, '-');
+    // Mehrere Bindestriche durch einen ersetzen
+    $clean = preg_replace('/-+/', '-', $clean);
+    return $clean;
+}
+
+// CORS-Header
+header('Access-Control-Allow-Origin: *');
+header('Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS');
+header('Access-Control-Allow-Headers: Content-Type');
+
+// OPTIONS-Request behandeln
+if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
+    http_response_code(200);
+    exit;
+}