VulkanBackend.load_model treated any id that isn't a '.gguf' path / file
/ URL as a HuggingFace repo to download. A configured gguf addressed by
its automatic alias ('coe-…-q4_k_m', no extension) thus 404'd against
the Hub instead of loading the local file. Resolve the alias via
_resolve_local_gguf (configured-entry + cache-dir match) first; only fall
back to the HF path when no local gguf is found.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>