feat(aws): add claude-sonnet-4-6 Bedrock mapping and cross-region support

[wellsgz]

Summary

• add AWS Bedrock model mapping for claude-sonnet-4-6 -> anthropic.claude-sonnet-4-6
• add cross-region availability entry for anthropic.claude-sonnet-4-6 (us, eu, ap)
• scope is AWS constants only, following the claude-opus-4-6 AWS constants pattern

Verification

• confirmed entries exist in relay/channel/aws/constants.go
• attempted go test ./relay/channel/aws/... with local GOCACHE/GOMODCACHE
• test execution is blocked in this environment by inability to resolve proxy.golang.org

Reference

• AWS CLI model ID confirmation used: anthropic.claude-sonnet-4-6

Summary by CodeRabbit

Release Notes

• New Features
  • Added support for Claude Sonnet 4.6 model
  • Enabled multi-region availability across US, Asia Pacific, and EU regions

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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Walkthrough

Added support for the claude-sonnet-4-6 model in AWS configuration by registering its model ID mapping and enabling cross-region deployment across US, AP, and EU regions.

Changes

Cohort / File(s)	Summary
AWS Model Configuration relay/channel/aws/constants.go	Added claude-sonnet-4-6 model entry to awsModelIDMap and enabled cross-region permissions in awsModelCanCrossRegionMap for US, AP, and EU regions.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• feat: add claude-opus-4-5-20251101 #2293: Modifies the same AWS constants file to add new Claude model entries and cross-region permissions.
• feat: add claude-opus-4-6 #2863: Adds Claude model variant entries to awsModelIDMap and awsModelCanCrossRegionMap in the same file.
• feat: 新增支持目前已发布的amazon nova model #1882: Updates AWS model mappings with new Anthropic Claude model entries and regional flags.

Suggested reviewers

• seefs001

Poem

🐰 A new Sonnet variant hops into play,
Cross-regions aligned in three regions today,
Claude's latest edition now spread far and wide,
AWS channels with hoppy, new pride! 🎉

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main changes: adding claude-sonnet-4-6 Bedrock mapping and cross-region support, which directly aligns with the file modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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