### Check for existing issues

- [x] I have searched the existing issues and checked that my issue is not a duplicate.

### The Feature

We use LiteLLM together with BlockRun (https://blockrun.ai). It'd be great if LiteLLM could integrate with BlockRun models natively, the same way it supports OpenAI / Anthropic / Bedrock. Today we route through the third-party adapter blockrun-litellm (https://github.com/BlockRunAI/blockrun-litellm), which works fine — but having BlockRun in litellm directly would mean one less dependency and we could put BlockRun straight in config.yaml (no sidecar). BlockRun's chat API is already OpenAI-compatible (including streaming), so the integration should be small. Reference implementation: https://github.com/BlockRunAI/blockrun-litellm Thanks for considering!

### Motivation, pitch

We use LiteLLM together with BlockRun (https://blockrun.ai). It'd be great if LiteLLM could integrate with BlockRun models natively, the same way it supports OpenAI / Anthropic / Bedrock. Today we route through the third-party adapter blockrun-litellm (https://github.com/BlockRunAI/blockrun-litellm), which works fine — but having BlockRun in litellm direct…