Spencer Grimes 9f14e8c745 feat: add audio effects (pitch and speed control) ...

- Added new audio_effects.py module with pitch shift and speed change
- Pitch range: -12 to +12 semitones (higher = chipmunk, lower = deeper)
- Speed range: 0.5 to 2.0x (higher = faster, lower = slower)
- Maximum 2 active effects per user (performance optimization)
- Added /effects command group:
  - /effects list - Shows current effects with descriptions
  - /effects set pitch|speed <value> - Apply effects
  - /effects reset - Confirmation UI to clear all effects
- Effects persist across restarts in preferences.json
- Updated /voice preview to support optional pitch/speed parameters
- Effects applied in _generate_wav_bytes using librosa
- Added performance warnings when processing takes >1 second
- Updated README with effects documentation

2026-01-31 15:43:29 -06:00

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