[Bug] [Self-host Model] Custom model names - "Only ABC MODEL allowed now, your model gpt-3.5-turbo"

[zs-dima]

Could be nice to add custom model names.
Currently client displays only gpt-4* and gpt-3* models available to select.
(qwen-v1, ernie, spark, llama, chatglm are not available to select)

For the self-host Models names could be different, this names can be queried */v1/models.
Currently actual self-host Models names are not displayed and it is no option to select it or enter manually.
So it leads to error:

  "object": "error",
  "message": "Only ABC MODEL allowed now, your model gpt-3.5-turbo",
  "code": 40301

Could be nice to add

1. parameter to select default model name, so every user will not need to select it manually:
   docker run -e MODEL_NAME="ABC MODEL"
2. query available model names */v1/models and display actual models names in settings.