Dockerfile

# Multi-stage production build for NEREUS
# Stage 1: Build React/TypeScript Frontend
FROM node:20-alpine AS frontend-builder
WORKDIR /app/frontend
COPY frontend/package*.json ./
RUN npm install
COPY frontend/ ./
RUN npm run build

# Stage 2: Production Python Backend
FROM python:3.12-slim
WORKDIR /app

# Install system dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    && rm -rf /var/lib/apt/lists/*

# Install Python requirements
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Copy backend application
COPY backend/ ./backend/

# Copy compiled frontend from builder
COPY --from=frontend-builder /app/frontend/dist ./frontend/dist

# Expose default port
EXPOSE 8000
ENV PORT=8000

# Launch Uvicorn production server
CMD ["sh", "-c", "uvicorn backend.main:app --host 0.0.0.0 --port ${PORT:-8000}"]