Before the quickrun (Run) button fires /api/model/serve, ask the deps
API whether the chosen backend (vllm / sglang / llama_cpp) is actually
installed on the target server. If not:
- Toast: '<backend> not installed on <host>. Opening Dependencies …'
- Route the user into the Dependencies tab via the existing
_openCookbookDependencies helper (now exported as
openCookbookDependencies)
- Auto-expand the recipe panel for that backend
- Pre-select the user's model in the panel's picker so the right
recipe is highlighted out of the box
The serve task is suppressed; the Run button is re-enabled. Once the
install task finishes in Running, the user clicks Run again.
cookbook-diagnosis.js: openCookbookDependencies takes an opts object
that, when expandRecipe is set, finds the row's caret and clicks it,
then matches a recipe label by model (currently only MiniMax has a
specific entry; the generic fallback stays selected otherwise).
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