Add Claude Opus 4.7 to documentation (#54113)

## Summary

- Add Claude Opus 4.7 to the pricing table with same rates as Opus 4.6
- Add Claude Opus 4.7 to context windows table (1M context)
- Update model retirements to include Opus 4.7 as upgrade path from Opus
4.1
- Add Opus 4.7 to Bedrock extended context section

Release Notes:

- N/A
809a511089morgankrey committed on 4/16/2026, 7:31:03 PM· committed by GitHubparent496a78e
2 files changedLine totals unavailable