Fix FER import for backend

app.py

@@ -9,7 +9,12 @@ import faiss
 import numpy as np
 import cv2
 from mtcnn import MTCNN
-from fer import FER
+# Robust import for FER, works with different fer versions
+try:
+    from fer import FER
+except ImportError:
+    from fer.fer import FER
+
 from dotenv import load_dotenv
 from flask import Flask, request, jsonify
 from werkzeug.security import generate_password_hash, check_password_hash