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/index.php

@@ -0,0 +1,37 @@
+<?php
+
+error_log("API Request: " . $_SERVER['REQUEST_METHOD'] . " " . $_SERVER['REQUEST_URI']);
+require_once __DIR__ . '/config.php';
+require_once __DIR__ . '/database.php';
+require_once __DIR__ . '/Router.php';
+
+// JSON-Response-Header
+header('Content-Type: application/json');
+
+// Request-Method und Pfad ermitteln
+$method = $_SERVER['REQUEST_METHOD'];
+$requestUri = $_SERVER['REQUEST_URI'];
+$path = parse_url($requestUri, PHP_URL_PATH);
+
+// Base-Path entfernen
+$basePath = API_BASE;
+if (strpos($path, $basePath) === 0) {
+    $path = substr($path, strlen($basePath));
+}
+
+// Pfad in Segmente aufteilen
+$pathSegments = array_filter(explode('/', trim($path, '/')));
+
+// Datenbankverbindung und Router
+$db = new Database();
+$pdo = $db->getConnection();
+$router = new Router($pdo);
+
+// Routing
+try {
+    $response = $router->route($method, $pathSegments);
+    echo json_encode($response);
+} catch (Exception $e) {
+    http_response_code(500);
+    echo json_encode(['success' => false, 'error' => $e->getMessage()]);
+}