feat: implement docker infrastructure (US-001)

- Add docker-compose.yml with postgres, redis, api, and web services
- Add multi-stage Dockerfile for API (Python 3.11)
- Add multi-stage Dockerfile for web (Node.js 20 + nginx)
- Add Makefile with common development commands
- Add .env.example with all required environment variables
- Add placeholder pyproject.toml and package.json for builds
- Configure health checks for all services
- Setup persistent volumes for postgres, redis, and repos
- Run services as non-root users

apps/api/Dockerfile

@@ -1,18 +1,51 @@
-FROM python:3.12-slim
+# Build stage
+FROM python:3.11-slim as builder
+
+WORKDIR /build
+
+# Install build dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    gcc \
+    libpq-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install Python dependencies
+COPY pyproject.toml .
+RUN pip install --no-cache-dir --user -e ".[dev]"
+
+# Production stage
+FROM python:3.11-slim
+
+# Create non-root user
+RUN groupadd -r appgroup && useradd -r -g appgroup appuser
 
 WORKDIR /app
 
-ENV PYTHONDONTWRITEBYTECODE=1
-ENV PYTHONUNBUFFERED=1
+# Install runtime dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libpq5 \
+    git \
+    && rm -rf /var/lib/apt/lists/*
 
-RUN groupadd -r appgroup && useradd -r -g appgroup appuser
+# Copy dependencies from builder
+COPY --from=builder /root/.local /home/appuser/.local
+ENV PATH=/home/appuser/.local/bin:$PATH
 
-COPY app/ ./app/
-COPY pyproject.toml ./
-RUN pip install --no-cache-dir -e "."
+# Copy application code
+COPY --chown=appuser:appgroup . .
 
+# Create directories for repo storage
+RUN mkdir -p /data/repos && chown -R appuser:appgroup /data/repos
+
+# Switch to non-root user
 USER appuser
 
+# Expose port
 EXPOSE 8000
 
-CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD python -c "import urllib.request; urllib.request.urlopen('http://localhost:8000/health')" || exit 1
+
+# Run the application
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]