infra: Dockerfile + docker-compose per paper trader su VPS

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Dockerfile

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+FROM python:3.11-slim
+
+COPY --from=ghcr.io/astral-sh/uv:latest /uv /usr/local/bin/uv
+
+WORKDIR /app
+
+COPY pyproject.toml uv.lock ./
+RUN uv sync --frozen --no-dev
+
+COPY src/ src/
+
+VOLUME /app/data
+
+CMD ["uv", "run", "python", "-m", "src.live.paper_trader"]