Enhance project documentation with updated architecture, PostgreSQL integration, and local development setup. Refine admin panel and GitHub Actions details. Remove Firebase configuration from .env.example and clarify database fallback mechanisms.

scripts/db-check.php

@@ -0,0 +1,39 @@
+<?php
+/**
+ * Kurzer Verbindungstest zur lokalen Postgres-Instanz.
+ * Aufruf (im Projektroot):
+ *   php scripts/db-check.php
+ */
+require_once dirname(__DIR__) . '/config.php';
+require_once dirname(__DIR__) . '/helpers.php';
+
+if (!extension_loaded('pdo_pgsql')) {
+    fwrite(STDERR, "PHP-Extension pdo_pgsql fehlt. z. B.: sudo apt install php-pgsql\n");
+    exit(1);
+}
+
+$url = getenv('DATABASE_URL');
+if (!$url) {
+    fwrite(STDERR, "DATABASE_URL ist nicht gesetzt. In .env eintragen (siehe .env.example).\n");
+    exit(1);
+}
+
+$pdo = get_db_connection();
+if (!$pdo) {
+    fwrite(STDERR, "Keine DB-Verbindung zu: {$url}\n");
+    fwrite(STDERR, "Prüfe: Docker läuft?  docker compose -f docker-compose.dev.yml ps\n");
+    exit(1);
+}
+
+init_db();
+
+$count = (int) $pdo->query('SELECT COUNT(*) FROM recipes')->fetchColumn();
+echo "Verbindung OK. Rezepte in DB: {$count}\n";
+
+if ($count > 0) {
+    $stmt = $pdo->query("SELECT slug, data->'i18n'->'en'->>'title' AS title FROM recipes LIMIT 5");
+    echo "\nBeispiel-Zeilen:\n";
+    while ($row = $stmt->fetch()) {
+        echo "  - {$row['slug']}: {$row['title']}\n";
+    }
+}