Gemini chat rows missing rate cards and modalities #497

Problem

Many current gemini chat rows have no rate card or no modalities (live GET /v1/models?provider=gemini&activity=chat, 2026-10-26, 45 rows not deprecated).

No pricing (19): antigravity-preview-05-2026, antigravity-preview-09-2026, antigravity-preview-latest, aqa, deep-research-max-preview-04-2026, deep-research-preview-04-2026, deep-research-pro-preview-12-2025, gemini-2.5-computer-use-preview-10-2025, gemini-2.5-flash-native-audio-latest, gemini-2.5-flash-native-audio-preview-09-2025, gemini-3.5-flash, gemini-3.7-flash, gemini-flash-latest, gemini-flash-lite-latest, gemini-omni-flash-preview, gemini-pro-latest, gemma-4-26b-a4b-it, gemma-4-31b-it, nano-banana-pro-preview

No modalities (10): antigravity-preview-latest, aqa, gemini-2.5-flash-native-audio-latest, gemini-2.5-flash-native-audio-preview-09-2025, gemini-flash-latest, gemini-flash-lite-latest, gemini-pro-latest, gemma-4-26b-a4b-it, gemma-4-31b-it, nano-banana-pro-preview

Google publishes prices for several of these, for example gemini-3.7-flash at https://ai.google.dev/gemini-api/docs/pricing#gemini-3.7-flash. The -latest ids are aliases of dated models that have the facts.

TanStack AI now skips a native row with no modalities instead of filling it from OpenRouter (TanStack/ai#1308), and prices calls live from the rate card (docs/advanced/model-prices.md). These gaps show up as "no price" and as skipped models.

Ask

• Add rate cards from Google's pricing page where it lists the model.
• Fill modalities from the model page, or resolve each -latest id to the row it points at (as aliases).
• Leave a fact null where Google publishes nothing, with a source-silent ledger entry.

Acceptance

• gemini-3.7-flash and gemini-3.5-flash have a rate card that evaluateCard prices.
• gemini-flash-latest, gemini-flash-lite-latest, and gemini-pro-latest have modalities, or are aliases on their dated rows.