feat: quiz, cheat sheets, admin modules - MC quiz, search, user mgmt, content import

edu/api/cheatsheets.php

@@ -0,0 +1,28 @@
+<?php
+require_auth();
+
+// GET /api/cheatsheets
+if (get_method() === 'GET' && empty($segments[1])) {
+    $stmt = $pdo->query("SELECT id, slug, title, category FROM cheatsheets ORDER BY category, title");
+    json_ok(['cheatsheets' => $stmt->fetchAll()]);
+}
+
+// GET /api/cheatsheets/search?q=...
+if (get_method() === 'GET' && ($segments[1] ?? '') === 'search') {
+    $q = get_param('q', '');
+    if (mb_strlen($q) < 2) json_error('Mindestens 2 Zeichen');
+    $stmt = $pdo->prepare("SELECT id, slug, title, category FROM cheatsheets WHERE content_md ILIKE :q OR title ILIKE :q ORDER BY title");
+    $stmt->execute([':q' => '%' . $q . '%']);
+    json_ok(['cheatsheets' => $stmt->fetchAll(), 'query' => $q]);
+}
+
+// GET /api/cheatsheets/{slug}
+if (get_method() === 'GET' && !empty($segments[1])) {
+    $stmt = $pdo->prepare("SELECT * FROM cheatsheets WHERE slug = :slug");
+    $stmt->execute([':slug' => $segments[1]]);
+    $sheet = $stmt->fetch();
+    if (!$sheet) json_error('Cheat Sheet nicht gefunden', 404);
+    json_ok(['cheatsheet' => $sheet]);
+}
+
+json_error('Unbekannter Cheatsheet-Endpunkt', 404);