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当输入片段与输出参数完全一致（h264/yuv420p/同分辨率/同帧率/无字幕/无特效）时，
走 FFmpeg stream copy 不重编码，性能提升 10 倍以上（典型场景 20s → 1-2s）。
核心改动：
1. probe_video_info 增强：返回编码/像素格式/音频信息（用于 copy 条件判断）
2. _can_use_stream_copy：7项条件检查（编码/分辨率/帧率/像素格式/字幕/trim等）
3. _try_render_stream_copy：stream copy 执行，失败自动回退到重编码
4. 单clip直通场景先尝试 stream copy，不满足或失败再回退带滤镜的直通渲染
5. trim 用 -ss/-t 实现，无需滤镜，copy 模式下也能用
安全保障：
- 条件不满足自动跳过，不影响现有渲染质量
- FFmpeg 失败自动回退到重编码，不影响成功率
- 输出文件为空时判定失败并清理损坏文件
测试：9个新增单测 + 现有75个统一渲染测试，全绿 ✅
（含条件判断、成功路径、失败回退、完整渲染流程等场景）