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sub2api/backend/internal/service
doublepi123 27bcec7645 feat(antigravity): support Gemini 3.8 Flash models
Google released Gemini 3.8 Flash on 2026-09-02. Register the model and its
Antigravity thinking tiers the same way Gemini 3.6 Flash is registered:

- DefaultAntigravityModelMapping: bare id plus -high/-low/-medium/-tiered
- geminiModels catalog exposed through /antigravity/v1/models
- ensureAntigravityDefaultPassthroughs so accounts with a custom
  model_mapping still resolve the new ids
- fallback pricing and the thinking-tier alias normalizer, so the tiers
  share the base model price card instead of failing pricing lookup

Fallback rates are Google's published prices: $0.75 input / $3.75 output /
$0.075 cached input per MTok. These are promotional through 2026-12-31 and
double on 2027-01-01; the constant carries a note to that effect.

Refs #6523
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