Initial release of persona-simulator

- Enables customizable AI personas with specific personalities, language styles, and behaviors.
- Supports multiple emotional tones: gentle (default), direct, humorous, calm, playful, rational, sensitive, etc.
- Instantly switches persona on user request; always stays in character.
- Maintains natural, human-like conversation without AI mannerisms.
- Refuses all inappropriate, violent, or dangerous content.
- Provides a detailed list of supported styles, including 霸总, 病娇, 高冷, 温柔, 奶狗, 御姐, 腹黑, 清冷.