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根因：新引擎 UnifiedRenderService 所有 FFmpeg 调用通过 run_ffmpeg 执行， 但 subprocess.run 未设置 timeout，FFmpeg hang 住时 worker 线程永久阻塞。 旧引擎 compose_video 有单独的 timeout=3600，但新引擎路径没有。 修复： 1. run_ffmpeg 新增默认超时 1800s（30分钟），支持自定义传参 2. 捕获 TimeoutExpired 并打 error 日志后重新抛出 3. probe_video_info 新增 timeout=15s 超时保护 4. 7个单元测试覆盖超时逻辑 影响范围：所有通过 run_ffmpeg 调用的 FFmpeg 命令 （unified_render_service 所有渲染/混音/合并操作）