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"]

docker-compose.yml

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+services:
+  paper-trader:
+    build: .
+    container_name: pythagoras-paper
+    restart: unless-stopped
+    volumes:
+      - ./data:/app/data
+    environment:
+      - PYTHONUNBUFFERED=1
+    healthcheck:
+      test: ["CMD", "python", "-c", "import json; s=json.load(open('/app/data/paper_trades/status.json')); assert s['last_update']"]
+      interval: 120s
+      timeout: 10s
+      retries: 3