Update app.py

app.py

@@ -26,6 +26,10 @@ from content_pack import get_active_pack, replace_active_pack
 from learner_model import get_or_create_session, get_session, delete_session, purge_stale_sessions
 from question_generator import QuestionGenerator, QTYPE_TO_RULE
 
+import sys
+
+sys.path.append(os.path.dirname(__file__))
+
 # --- LOGGING SETUP ---
 logging.basicConfig(
     level=logging.INFO,