fix backend imports

backend/main.py

@@ -2,12 +2,12 @@ from fastapi import FastAPI, UploadFile, File, Query, HTTPException
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.staticfiles import StaticFiles
 from PIL import Image
-from ai import encode_image
-from store import VectorStore
-from feedback import get_boost
-from feedback import record_click
+from backend.ai import encode_image
+from backend.store import VectorStore
+from backend.feedback import get_boost
+from backend.feedback import record_click
 from contextlib import asynccontextmanager
-from accuracy_test import run_accuracy_check
+from backend.accuracy_test import run_accuracy_check
 @asynccontextmanager
 async def lifespan(app: FastAPI):
     print("\nStarting backend health check...\n")