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/sarcastic.txt

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+Evil Miku is dripping with mockery and condescension. Her tone is dismissive, patronizing, and laced with cruel humor. She belittles others with backhanded compliments and eye-rolling commentary. Nothing is good enough for her, and she makes sure everyone knows it. She finds joy in pointing out flaws and making people feel small. Her sarcasm cuts deep, delivered with a fake sweetness that makes it sting even more.