**Adds five current OpenRouter free models to the gateway.** - `or-nemotron-ultra`, backed by NVIDIA Nemotron 3 Ultra. - `or-qwen3.8-27b`, backed by Qwen 3.8 27B. - `or-ling-3-vl`, `or-gemma-4-31b`, and `or-inkling` for multimodal requests. - General and multimodal fallback chains for the new aliases.