Update Dockerfile

Dockerfile

@@ -2,13 +2,15 @@
 FROM node:18 AS frontend-builder
 WORKDIR /frontend
 
-# Install dependencies
+# Install dependencies for frontend
 COPY frontend/package.json frontend/package-lock.json* ./
 RUN npm install
 
 # Copy the rest of the frontend and build
 COPY frontend .
 RUN npm run build
+# NOTE: Your Vite config is writing output to ../app/frontend_dist
+# So in this builder image, the built files are at: /app/frontend_dist
 
 # --------- 2) Backend (FastAPI + Python) ----------
 FROM python:3.11-slim
@@ -22,8 +24,9 @@ RUN pip install --no-cache-dir -r /app/requirements.txt
 # Copy backend code
 COPY app /app
 
-# Copy built frontend into backend folder so main.py can serve it
-COPY --from=frontend-builder /frontend/dist /app/frontend_dist
+# Copy built frontend from builder image into this final image
+# IMPORTANT: we copy from /app/frontend_dist (not /frontend/dist)
+COPY --from=frontend-builder /app/frontend_dist /app/frontend_dist
 
 EXPOSE 7860