infrastructure-bedrock-region-routi-when-using-bedrock-converse-endpoint-with-a-router-ceeab81d

THEN Modify the router's endpoint assembly logic to prioritize the `aws_region_name` provided in the model's litellm_params over the environment's default region when constructing the Bedrock runtime URL. Extract the region from the config and use it in the endpoint path.

In the router's endpoint builder, replace the fallback to `boto3.Session().region_name` with the config's `aws_region_name` if present:

```python
region = model_config.get('litellm_params', {}).get('aws_region_name') or boto3.Session().region_name
endpoint = f'https://bedrock-runtime.{region}.amazonaws.com/{path}'
```