chore: 同步 motion-use 0.4.1 旁白修复

[leeguooooo]

同步 motion-use 0.4.1 版本及默认旁白描述。该修复恢复自动生成/复用语音，并在最终混音缺少旁白时阻断交付。仅修改 motion-use 条目和对应 README 段落；两项市场测试通过。

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