v6.9.29-0

Changelog

• 1f030dc Merge pull request #23 from karlorz/bot/release-pr
• c6baa64 Merge pull request router-for-me#2892 from router-for-me/fix-provider
• 4e1c26a Merge remote-tracking branch 'upstream/main'
• 894baad feat(api): integrate auth index into key retrieval endpoints for Gemini, Claude, Codex, OpenAI, and Vertex
• c26936e fix(management): stabilize auth-index mapping
• a64141a fix(tests): remove obsolete config_auth_index_test file
• da43f63 fix(tests): update Gemini family test case numbers for consistency
• d9a3b3e fix(tests): update model lookup references and enhance Claude executor tests
• e7e6cdd release: v6.9.29-0