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Dockerfile

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+# ── Stage 1: Build React frontend ────────────────────────────────────────────
+FROM node:18-alpine AS frontend-build
+
+WORKDIR /app/frontend
+COPY frontend/package*.json ./
+RUN npm ci --silent
+COPY frontend/ ./
+RUN npm run build
+
+# ── Stage 2: Flask + Gunicorn production image ────────────────────────────────
+FROM python:3.12-slim
+
+WORKDIR /app
+
+COPY backend/requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY backend/ ./
+
+# Copy compiled React build into Flask static folder
+COPY --from=frontend-build /app/frontend/dist ./app/static
+
+# Persistent data directory for SQLite
+RUN mkdir -p /app/data
+
+EXPOSE 8080
+
+CMD ["gunicorn", "--bind", "0.0.0.0:8080", "--workers", "2", "--timeout", "120", "run:app"]