The dropdown is built from the hardcoded MODEL_CHOICES list in app.py, not from
OmniRoute, so 'ollama/qwen2.5*' existed upstream but could never appear in DSH.
- add ollama/qwen2.5:14b and ollama/qwen2.5-coder:14b to MODEL_CHOICES + MODEL_LABELS
- labels note that Ollama must be started first, since it now boots off on .27
- docs/dsh-architecture.md: new section on model selection, incl. the rebuild
requirement (app.py is baked into the image via COPY . .) and the ordering trap
that a model can be live in OmniRoute yet invisible in DSH
Verified: /api/models lists both ids on 3081-3084, and real streamed replies come
back from both local models through DSH.