多模型参数配置

可以参考：https://github.com/mlc-ai/mlc-llm/blob/main/android/MLCChat/mlc-package-config.json

// mlc-app-config.json
{
  "device": "android",
  "model_list": [
    {
      "model": "/sda/xj/mlc-llm-llama3/mlc-llm/android/MLCChat/model_weights/hf/mlc-ai/MinicPM-2B-dpo-bf16-llama-format-g4f16_1",
      "estimated_vram_bytes": 2036816936,
      "model_id": "MiniCPM-2B-dpo-bf16-llama-format_q4f16_1",
      "bundle_weight": true
    },
    {
      "model": "/sda/xj/mlc-llm-llama3/mlc-llm/android/MLCChat/model_weights/hf/mlc-ai/Llama-3-8B-Instruct-llama-format-q4f16_1",
      "estimated_vram_bytes": 4679979417,
      "model_id": "Llama-3-8B-Instruct-llama-format-q4f16_1",
      "bundle_weight": true
    }
  ]
}