Remove config options that are discoverable through the API

[lpiwowar]

There are some config options that are discoverable through the /models API. Let's remove them and discover them via the API call.

We don't have to keep it in the env as this would be different for diff models and what the model has been deployed with. we can get using api call

ramishra@fedora:~/work/LLM/chatbot$ curl http://xxx:8000/v1/models \
  -H "Authorization: Bearer xxxx"
{"object":"list","data":[{"id":"deepseek-ai/DeepSeek-R1-Distill-Llama-8B","object":"model","created":1746600067,"owned_by":"vllm","root":"deepseek-ai/DeepSeek-R1-Distill-Llama-8B","parent":null,**"max_model_len":32000**,"permission":[{"id":"modelperm-78f16fdc0769472c8ee8dc4b96aae500","object":"model_permission","created":1746600067,"allow_create_engine":false,"allow_sampling":true,"allow_logprobs":true,"allow_search_indices":false,"allow_view":true,"allow_fine_tuning":false,"orga

Originally posted by @rabi in #134 (comment)

[lpiwowar]

Closed in -> #154