* fix(google): add gemini-3.1-flash-lite to provider catalog
Adds the missing gemini-3.1-flash-lite model definition to the
GOOGLE_GEMINI_TEXT_MODELS array. This resolves the ProviderFailoverError
when configuring google-vertex/gemini-3.1-flash-lite.
Fixes#89390
* test(google): cover Gemini flash lite catalog row
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Co-authored-by: Peter Steinberger <steipete@gmail.com>