feat(MediaSystem): 增加运动模糊与修复录制色彩发灰#5
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1. 录制运动模糊 (Motion Blur)
- 基于高频帧累积实现录制运动模糊，平滑录制画面的拖影过渡。
- 全时采样曝光：开启后不舍弃多余的高频帧，在时间槽内全部累积后取均值。
- MotionBlurProcessor 独立模块：将帧累积、计算着色器调度、色彩空间转换从 VCD3D11Manager
中抽取为独立的 MotionBlurProcessor 类，通过组合方式使用，解决上帝类问题。
- 轻量 CSBindingGuard 替代 D3D11StateSaver：每次调度只备份/恢复实际修改的 4 个 CS 绑定
(1 Shader + 1 SRV + 1 UAV + 1 CB)，减少 90%+ 的 D3D11 API 调用，降低 GPU 开销。
- 线性空间累积：sRGB → Linear 累加 → 均值后转回 sRGB，避免拖影发暗。
2. 画面色彩修复 (Color Range Mismatch)
- 修复录制视频在播放器中对比度不足、发灰的问题。
- 将视频流的 color_range 标记改为 AVCOL_RANGE_MPEG (Limited Range)，匹配硬件 RGB->YUV
转换的实际输出范围，使播放器正确映射对比度。
3. 关键解耦与UI调整
- 移除 MediaSystem 中所有 CS2 引擎依赖（TimeController、host_framerate 指令下发等）。
- 移除 TwoPassDirector 模块，相关双程音画分离功能将移至 CS2 专属模块中实现。
- Rename '简易运动模糊' to '运动模糊' in UI.
- Add '模糊强度 (快门角度)' slider to adjust the shutter parameter.
- Update RecordParams to support the new shutter setting.
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