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Dockerfile

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+FROM node:18-alpine AS frontend-builder
+
+# Build frontend
+WORKDIR /app/frontend
+COPY frontend/package*.json ./
+RUN npm ci
+
+COPY frontend/ ./
+# Set environment for single container (use relative paths)
+ENV NEXT_PUBLIC_API_URL=""
+RUN npm run build
+
+# Main container with Python and built frontend
+FROM python:3.11-slim
+
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    gcc \
+    g++ \
+    libldap2-dev \
+    libsasl2-dev \
+    libssl-dev \
+    default-libmysqlclient-dev \
+    pkg-config \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy and install Python dependencies
+COPY backend/requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy backend application
+COPY backend/ ./
+
+# Copy built frontend from builder stage
+COPY --from=frontend-builder /app/frontend/out ./frontend/out
+
+# Create necessary directories
+RUN mkdir -p logs uploads
+
+# Set environment variables
+ENV FLASK_APP=app.py
+ENV PYTHONUNBUFFERED=1
+ENV FLASK_ENV=production
+
+# Expose only one port
+EXPOSE 12011
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --retries=3 --start-period=40s \
+  CMD curl -f http://localhost:12011/api/health/ || exit 1
+
+# Run with Gunicorn for production (supports 200+ users)
+CMD ["gunicorn", "--bind", "0.0.0.0:12011", "--workers", "4", "--threads", "2", "--timeout", "120", "--keep-alive", "2", "--max-requests", "1000", "--max-requests-jitter", "100", "app:app"]