fix: update Alembic configuration for proper module imports

Author: VuQuoc18

backend/app/alembic/env.py

@@ -1,9 +1,13 @@
 import os
+import sys
 from logging.config import fileConfig
 
 from alembic import context
 from sqlalchemy import engine_from_config, pool
 
+# Add the parent directory of 'app' to Python path
+sys.path.append(os.path.dirname(os.path.dirname(os.path.dirname(__file__))))
+
 # this is the Alembic Config object, which provides
 # access to the values within the .ini file in use.
 config = context.config