Add Claude Opus 4.7 BYOK (#54077)

<img width="767" height="428" alt="Screenshot 2026-04-16 at 11 29 13 AM"
src="https://github.com/user-attachments/assets/e8b450fa-aefc-4dec-a286-b211bd492011"
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Add Claude Opus 4.7 (`claude-opus-4-7`) to the anthropic, bedrock, and
opencode provider crates.

Key specs:
- 1M token context window
- 128k max output tokens
- Adaptive thinking support
- AWS Bedrock cross-region inference (global, US, EU, AU)

Release Notes:

- Added Claude Opus 4.7 as an available language model
87b47a4b08Richard Feldman committed on 4/17/2026, 2:51:32 PM· committed by GitHubparent294feb9
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