Create Dockerfile

Dockerfile

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+FROM node:20-bullseye AS frontend_build
+WORKDIR /app/frontend
+COPY frontend/package.json frontend/package-lock.json* ./
+RUN npm install
+COPY frontend/ ./
+RUN npm run build
+
+FROM python:3.11-slim AS runtime
+WORKDIR /app
+
+# backend
+COPY backend/requirements.txt /app/backend/requirements.txt
+RUN pip install --no-cache-dir -r /app/backend/requirements.txt
+COPY backend/ /app/backend/
+
+# frontend dist
+COPY --from=frontend_build /app/frontend/dist /app/frontend_dist
+
+# simple static serving via fastapi
+RUN pip install --no-cache-dir starlette==0.38.5
+
+ENV PORT=7860
+
+# Start FastAPI + serve frontend dist
+CMD ["bash", "-lc", "python -c \"\
+import os; \
+from fastapi import FastAPI; \
+from fastapi.staticfiles import StaticFiles; \
+from backend.main import app as api; \
+app = FastAPI(); \
+app.mount('/api', api); \
+app.mount('/', StaticFiles(directory='/app/frontend_dist', html=True), name='static'); \
+import uvicorn; \
+uvicorn.run(app, host='0.0.0.0', port=int(os.environ.get('PORT','7860'))); \
+\""]