Remove duplicate pitch_detection from RVC Engine and improve UI consistency
Cleaned up RVC Engine node by removing duplicate pitch_detection parameter that belonged in RVC Pitch Options.
Added sliders to RVC Pitch Options for better user experience and improved tooltips.
- Removed pitch_detection from RVC Engine INPUT_TYPES and function signature
- Added default 'rmvpe' fallback when RVC Pitch Options node not connected
- Added sliders to crepe_hop_length, filter_radius, and pitch_guidance for visual feedback
- Enhanced pitch_detection tooltip with comprehensive method descriptions
- Added new 'Unified Voice Changer - RVC X ChatterBox' workflow to README
- Created new 'Unified Workflows' section in README for modern v4+ workflows
Improves separation of concerns and provides better user experience with clearer parameter organization.