Phase 1: Foundation - Database schema, core PHP structure, JWT auth, and User CRUD

Implemented:
- Database schema (SQLite) with tables: users, profiles, posts, swipes, matches, chats, chat_messages, events, notifications, relationships, post_likes, post_comments, refresh_tokens, media
- Core PHP structure following skeleton pattern (www/api/)
- JWT Authentication (register, login, refresh, logout)
- User profile CRUD (show, update, delete, search)
- User sub-resources (posts, friends, followers, following)
- Minimal Firebase JWT implementation for PHP without Composer

www/api/public/index.php

@@ -1,20 +1,102 @@
 <?php
 /**
- * api.domain.de — REST API
+ * Sozial API - Entry Point
+ * 
+ * This is the main entry point for the Sozial REST API.
+ * All requests are routed through this file.
  */
-header('Content-Type: application/json');
 
-$method = $_SERVER['REQUEST_METHOD'];
+// Error reporting for development
+error_reporting(E_ALL);
+ini_set('display_errors', 0);
+ini_set('log_errors', 1);
 
-switch ($method) {
-    case 'GET':
-        echo json_encode(['status' => 'ok', 'message' => 'API läuft']);
-        break;
-    case 'POST':
-        $input = json_decode(file_get_contents('php://input'), true);
-        echo json_encode(['status' => 'received', 'data' => $input]);
-        break;
-    default:
-        http_response_code(405);
-        echo json_encode(['error' => 'Method not allowed']);
+// Autoloader
+spl_autoload_register(function ($class) {
+    // Convert namespace to file path
+    $prefixes = [
+        'Core\\' => __DIR__ . '/../src/core/',
+        'Modules\\' => __DIR__ . '/../src/modules/',
+        'Services\\' => __DIR__ . '/../src/services/',
+        'Utils\\' => __DIR__ . '/../src/utils/',
+        'Middleware\\' => __DIR__ . '/../src/core/',
+    ];
+    
+    foreach ($prefixes as $prefix => $baseDir) {
+        $len = strlen($prefix);
+        if (strncmp($prefix, $class, $len) === 0) {
+            $relativeClass = substr($class, $len);
+            $file = $baseDir . str_replace('\\', '/', $relativeClass) . '.php';
+            if (file_exists($file)) {
+                require $file;
+                return;
+            }
+        }
+    }
+});
+
+// Load configurations
+$dbConfig = require __DIR__ . '/../src/config/database.php';
+$jwtConfig = require __DIR__ . '/../src/config/jwt.php';
+$appConfig = require __DIR__ . '/../src/config/app.php';
+
+// Initialize database
+use Core\Database;
+Database::init($dbConfig);
+
+// Initialize database schema if tables don't exist
+$pdo = Database::getInstance();
+$stmt = $pdo->query("SELECT name FROM sqlite_master WHERE type='table' AND name='users'");
+if (!$stmt->fetch()) {
+    $schemaPath = __DIR__ . '/../database/schema.sql';
+    if (file_exists($schemaPath)) {
+        Database::initialize($schemaPath);
+    }
 }
+
+// Initialize JWT service
+use Services\JwtService;
+$jwtService = new JwtService($jwtConfig);
+
+// Initialize auth middleware
+use Middleware\Auth;
+Auth::setJwtService($jwtService);
+
+// Create request
+use Core\Request;
+$request = new Request();
+
+// Create router
+use Core\Router;
+$router = new Router();
+
+// Load controllers
+use Modules\Auth\AuthController;
+use Modules\User\UserController;
+
+$authController = new AuthController(Database::getInstance(), $jwtService);
+$userController = new UserController(Database::getInstance());
+
+// Auth routes
+$router->post('/auth/register', fn($req) => $authController->register($req));
+$router->post('/auth/login', fn($req) => $authController->login($req));
+$router->post('/auth/refresh', fn($req) => $authController->refresh($req));
+$router->post('/auth/logout', fn($req) => $authController->logout($req), ['Auth']);
+
+// User routes
+$router->get('/users/search', fn($req) => $userController->search($req));
+$router->get('/users/{id}', fn($req, $params) => $userController->show($req, $params));
+$router->patch('/users/{id}', fn($req, $params) => $userController->update($req, $params), ['Auth']);
+$router->delete('/users/{id}', fn($req, $params) => $userController->destroy($req, $params), ['Auth']);
+$router->get('/users/{id}/posts', fn($req, $params) => $userController->posts($req, $params));
+$router->get('/users/{id}/friends', fn($req, $params) => $userController->friends($req, $params));
+$router->get('/users/{id}/followers', fn($req, $params) => $userController->followers($req, $params));
+$router->get('/users/{id}/following', fn($req, $params) => $userController->following($req, $params));
+
+// Health check
+$router->get('/health', function($req) {
+    \Core\Response::success(['status' => 'ok', 'service' => 'sozial-api']);
+});
+
+// Dispatch request
+$router->dispatch($request);