feat: add CRUD functionality for classes with API endpoints and UI integration

backend/routes/api.py

@@ -460,6 +460,52 @@ def set_my_classes():
 
 
 
+
+# ── Klassen CRUD (directeur) ───────────────────────────────────────────────────
+
+@api_bp.route('/classes', methods=['GET'])
+@login_required
+@director_required
+def list_classes():
+    """Alle klassen van de school."""
+    classes = Class.query.filter_by(school_id=current_user.school_id)                         .order_by(Class.name).all()
+    return jsonify({'classes': [
+        {'id': c.id, 'name': c.name,
+         'teachers': [{'id': t.id, 'full_name': t.full_name} for t in c.teachers]}
+        for c in classes
+    ]})
+
+
+@api_bp.route('/classes', methods=['POST'])
+@login_required
+@director_required
+def create_class():
+    """Nieuwe klas aanmaken."""
+    data = request.get_json() or {}
+    name = data.get('name', '').strip()
+    if not name:
+        return jsonify({'error': 'Naam is verplicht'}), 400
+    if Class.query.filter_by(school_id=current_user.school_id, name=name).first():
+        return jsonify({'error': 'Een klas met deze naam bestaat al'}), 409
+    klas = Class(name=name, school_id=current_user.school_id)
+    db.session.add(klas)
+    audit_log('class.create', 'class', detail={'name': name})
+    db.session.commit()
+    return jsonify({'class': {'id': klas.id, 'name': klas.name, 'teachers': []}}), 201
+
+
+@api_bp.route('/classes/<int:class_id>', methods=['DELETE'])
+@login_required
+@director_required
+def delete_class(class_id):
+    """Klas verwijderen (enkel eigen school)."""
+    klas = Class.query.filter_by(id=class_id, school_id=current_user.school_id).first_or_404()
+    name = klas.name
+    db.session.delete(klas)
+    audit_log('class.delete', 'class', target_id=str(class_id), detail={'name': name})
+    db.session.commit()
+    return jsonify({'deleted': class_id})
+
 # ── Klas-leerkracht koppeling (directeur) ──────────────────────────────────────
 
 @api_bp.route('/classes/<int:class_id>/teachers', methods=['PUT'])