fix: 使用 .venv/bin/python -m playwright 安装 Chromium

Dockerfile

@@ -22,7 +22,7 @@ RUN pip install --no-cache-dir uv && \
 COPY . .
 
 # 安装 Playwright Chromium 浏览器（Crawl4AI 依赖）
-RUN playwright install chromium
+RUN .venv/bin/python -m playwright install chromium
 
 RUN chmod +x entrypoint.sh
 ENTRYPOINT ["./entrypoint.sh"]