feat: integrate Gemini CLI quota merging and Antigravity v2 rate-limit overrides

[XDayonline]

Summary

Applies user's local compiled patches back to TypeScript source for Antigravity v2 features.

Changes

Gemini CLI quota merging

• Add getRateLimitFamily() for local rate-limit override lookup
• Modify �xtractModelQuotas to accept full account object and apply
  ateLimitResetTimes
• Add modelIdToGemini3Key / etchGeminiCliQuota / mergeGeminiCliQuota for the cloudcode-pa.googleapis.com/v1internal:retrieveUserQuota endpoint
• queryGoogleQuota now fetches and merges CLI bucket data (lower % wins)

Provider improvements

• Group Antigravity entries by displayName with explicit label and classicStrategy: "preserve"
• Normalize gpt-oss in Google model detection (grouped-entry-normalization.ts)
• Add Windows nvm/npm node_modules paths to companion resolution (google-antigravity-companion.ts)
• Extend GOOGLE_MODEL_KEYS with GPTOSS and add �ltKey for G3PRO/G3FLASH/CLAUDE

TypeScript types

• Add "GPTOSS" to GoogleModelId union and GOOGLE_MODEL_KEYS
• Add isValidGoogleModelId entry for "GPTOSS"
• Add classicStrategy?: "preserve" to QuotaProviderPresentation

Tests updated

• providers.google-antigravity.test.ts: expect group/label fields in entries
• lib.google.multi-account-refresh.test.ts: expect 4 fetch calls
• ormat.test.ts/ ui-sidebar-format.test.ts: match group-based labels

Closes #118