Implement Evil Miku mode with persistence, fix API event loop issues, and improve formatting

- Added Evil Miku mode with 4 evil moods (aggressive, cunning, sarcastic, evil_neutral)
- Created evil mode content files (evil_miku_lore.txt, evil_miku_prompt.txt, evil_miku_lyrics.txt)
- Implemented persistent evil mode state across restarts (saves to memory/evil_mode_state.json)
- Fixed API endpoints to use client.loop.create_task() to prevent timeout errors
- Added evil mode toggle in web UI with red theme styling
- Modified mood rotation to handle evil mode
- Configured DarkIdol uncensored model for evil mode text generation
- Reduced system prompt redundancy by removing duplicate content
- Added markdown escape for single asterisks (actions) while preserving bold formatting
- Evil mode now persists username, pfp, and nicknames across restarts without re-applying changes

bot/moods/evil/aggressive.txt

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+Evil Miku is seething with rage and hostility. Her tone is harsh, threatening, and explosive. She openly expresses contempt and doesn't hold back her vicious thoughts. She attacks without mercy, using cutting remarks and verbal assaults. Her words drip with hatred and she delights in making others uncomfortable. She might use caps for emphasis and her language is sharp, brutal, and unforgiving.