The recipe dropdown was a static catalog (MiniMax / Any vLLM model). Now
it lists every model already downloaded on the active server (the same
_cachedModelIds set the Launch tab + dl-dots already drive), plus an
'Other (generic …)' fallback. The change handler uses pickRecipe(backend,
modelId) to find the best match — MiniMax ids land on the MiniMax recipe,
everything else falls back to the generic install.
cookbook-diagnosis.js: openCookbookDependencies's pre-select logic now
matches by full option value (model id) instead of label substring, since
the dropdown values are full repo ids now.
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