Stand 2026-04-13: PHP/MySQL Infrastruktur, Flussmanagement, Stadt-Prototyp

- PHP/MySQL Backend (XAMPP + Produktionsserver)
- Front-Controller, API-Endpunkte, Session-Management
- Flussmanagement-Simulation (Echtzeit, Punkt-basierter Fluss)
- Stadt & Raumplanung (Prototyp, Top-Down Kachelsystem)
- Klimawaechter 3D: Deiche kleiner, Baeume kippen, Budget angepasst
- persistence.ts: Dualer Speicher (localStorage + Server-API)
- 6 Unit-Test-Dateien fuer bestehende Simulationen

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

App/php/lib/Response.php

@@ -0,0 +1,21 @@
+<?php
+/**
+ * GeoGraSim — JSON Response Helpers
+ */
+
+class Response {
+    public static function json($data, int $status = 200): void {
+        http_response_code($status);
+        header('Content-Type: application/json; charset=utf-8');
+        echo json_encode($data, JSON_UNESCAPED_UNICODE);
+        exit;
+    }
+
+    public static function error(string $message, int $status = 400): void {
+        self::json(['error' => $message], $status);
+    }
+
+    public static function ok($data = null): void {
+        self::json($data ?? ['ok' => true]);
+    }
+}