Enables /v1/models endpoint query for custom providers (fixes qwen model not showing under qwen-vllm).
Changes:
- Added `type: openai` to `rtx6000-brain` and `qwen-vllm` providers
- Standardized base_url to full FQDN: \*.customer1.svc.cluster.local
- Added context_length to qwen-vllm provider
- Updated models.qwen-vllm base_url and context_length for consistency