feat: support multiple lora files & dynamic apply / remove lora

[jhen0409]

• Param: lora_list for init context with multiple lora files
• New context methods
  • async applyLoraAdapters(loraAdapters: Array<{ path: string; scaled?: number }>): Promise<void>
  • async removeLoraAdapters(): Promise<void>
  • async getLoadedLoraAdapters(): Promise<Array<{ path: string; scaled?: number }>>