新增示例库逻辑

docs/en/tutorials/voice-cloning.md

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+# Voice Cloning
+
+Use reference audio to implement voice cloning functionality.
+
+---
+
+## Prepare Reference Audio
+
+1. Prepare a clear audio file (MP3/WAV/FLAC)
+2. Recommended duration: 10-30 seconds
+3. Avoid background noise
+
+---
+
+## Usage Steps
+
+1. Select a TTS workflow that supports voice cloning (e.g., Index-TTS) in voice settings
+2. Upload reference audio file
+3. Test effects with "Preview Voice"
+4. Generate video
+
+---
+
+## Notes
+
+- Not all TTS workflows support voice cloning
+- Reference audio quality affects cloning results
+- Edge-TTS does not support voice cloning
+
+---
+
+## More Information
+
+Detailed voice cloning tutorial coming soon.
+