Merge branch 'router-for-me:main' into main

feat(openai): add responses/compact support

fix(openai): improve error handling for response conversion failures

feat(registry): add supported endpoints for GitHub Copilot models

Fixed: #747

feat(usage): add import/export functionality for usage statistics and enhance deduplication logic

refactor: extract parseGeminiFamilyUsageDetail helper to reduce duplication

feat: add cached token parsing for Gemini API responses

**fix(executor, auth): ensure index assignment consistency for auth objects**

fix(runtime): treat non-empty finishReason as terminal

fix(executor): expire stop chunks without usage metadata

feat(runtime): track antigravity usage and token counts

fix: preserve SSE usage metadata-only trailing chunks

fix(sse): preserve usage metadata for stop chunks

**feat(translator): add Antigravity translation logic**

feat(executor): share SSE usage filtering across streams

**feat(auth): add AuthIndex for diagnostics and ensure usage recording**

feat(gemini-cli): add multi-project support and enhance credential handling

feat(vertex): add usage source resolution for Vertex projects

fix(executor): ensure usage reporting for upstream responses lacking usage data

Refactor executor error handling and usage reporting

feat(usage): add support for tracking request source in usage records

rebuild branch

remove all

feat(usage): implement usage tracking infrastructure across executors