Add VibeVoice wildminder format compatibility
Technical changes:
- Implement [1] [2] [3] [4] numeric character tag support for native multi-speaker
- Replace synthetic voice samples with None for true zero-shot generation
- Increase CFG scale limit from 5.0 to 10.0
- Add direct Speaker mapping for numeric character tags
- Maintain full backward compatibility with existing character systems
Fix VibeVoice Native Multi-Speaker voice reference handling
Technical improvements:
- Add voice reference validation and normalization in native mode
- Detect invalid character name connections with helpful error messages
- Add auto-conversion fallback for misconnected inputs
- Implement global character-to-speaker mapping for SRT consistency
- Remove redundant debug output to clean up console logs
- Add auto-detection for manual Speaker format with mode switching
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