build(docker): add integration tests, Dockerfile, and docker-compose for packaging

Dockerfile

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+# Build stage
+FROM python:3.11-slim AS builder
+
+WORKDIR /app
+
+# Install build dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy project files
+COPY pyproject.toml .
+COPY src/ src/
+
+# Install build tools and build wheel
+RUN pip install --no-cache-dir build && \
+    python -m build --wheel && \
+    pip install --no-cache-dir --prefix=/install dist/*.whl
+
+# Production stage
+FROM python:3.11-slim
+
+WORKDIR /app
+
+# Create non-root user
+RUN useradd -m -r appuser && \
+    chown -R appuser:appuser /app
+
+# Copy installed packages from builder
+COPY --from=builder /install /usr/local
+
+# Copy application source
+COPY --chown=appuser:appuser src/ src/
+
+USER appuser
+
+EXPOSE 5000
+
+CMD ["uvicorn", "src.main:app", "--host", "0.0.0.0", "--port", "5000"]