Atlas: Infrastruktur + Team-Konventionen + Sprachregel Lernarbeit

- Design-System (assets/css/design-system.css) mit 21 Komponenten,
  iPad-Responsive-Breakpoints, Touch-Ziele 36px, Music-Player,
  Glossar-Tooltips
- Templates (sims/template.html + student/teacher-Dashboard)
- Docs: module-interface.md (inkl. 4a Sprachregel, 4b Leichte Sprache,
  4c iPad), content-architecture.md, crash-recovery.md, music-registry.md
- Admin-Infrastruktur: admin-modules.html + api/admin-modules.php
  (Titel, Emoji, Bild, Status, Dauer, Alter pro Modul)
- Inbox-System: _inbox/README.md + _status.md fuer Atlas + Briefings
  an Klima, Glossar, Lehrplan, Fluss
- Zentrale SFX-Pipeline (scripts/generate-sounds.py)
- DALL-E-Bilder: 8 Badges + 5 Glossar-Repraesentationsbilder (Querformat)
- Logo + Inter-Font lokal
- PHP-APIs: admin, glossar, levels, licenses, progress, waypoints,
  assignments, profile, tickets
- Spielsprache entfernt (admin-modules, admin-levels, schueler)
- Landing-Page-Bearbeitungen (Boote sichtbarer, Button-Hintergrund)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

App/php/api/classes.php

@@ -11,13 +11,13 @@ $db = Database::get();
 if ($method === 'GET') {
     $teacherId = Session::requireTeacher();
     $classes = $db->fetchAll(
-        'SELECT id, name, school_year, join_code, created_at FROM classes WHERE teacher_id = ? ORDER BY created_at DESC',
+        'SELECT id, name, school_year, join_code, created_at FROM classes WHERE teacher_id = ? AND deleted_at IS NULL ORDER BY created_at DESC',
         [$teacherId]
     );
     // Schueleranzahl pro Klasse
     foreach ($classes as &$c) {
         $c['student_count'] = (int)$db->fetchOne(
-            'SELECT COUNT(*) as cnt FROM students WHERE class_id = ?', [$c['id']]
+            'SELECT COUNT(*) as cnt FROM students WHERE class_id = ? AND deleted_at IS NULL', [$c['id']]
         )['cnt'];
     }
     Response::ok($classes);
@@ -64,13 +64,14 @@ if ($method === 'POST') {
         Response::ok();
     }
 
-    // === KLASSE LOESCHEN ===
+    // === KLASSE LOESCHEN (Soft-Delete, Schüler*innen werden Autodidakten) ===
     if ($action === 'delete') {
         $classId = (int)($body['classId'] ?? 0);
         $class = $db->fetchOne('SELECT id FROM classes WHERE id = ? AND teacher_id = ?', [$classId, $teacherId]);
         if (!$class) Response::error('Klasse nicht gefunden', 404);
 
-        $db->execute('DELETE FROM classes WHERE id = ?', [$classId]);
+        // Schüler*innen werden zu Autodidakten (class_id bleibt für Referenz, aber Klasse ist gelöscht)
+        $db->execute('UPDATE classes SET deleted_at = NOW() WHERE id = ?', [$classId]);
         Response::ok();
     }