feat(models): add Sonnet 5 via Bedrock

[analogpvt]

No description provided.

[coderabbitai]

Walkthrough

This PR adds an aws-bedrock provider configuration for claude-sonnet-5 and updates the related region and Bedrock 1-hour TTL test expectations.

Changes

Claude Sonnet 5 Bedrock Provider Support

Layer / File(s)	Summary
Bedrock provider config and test updates packages/models/src/models/anthropic.ts, packages/models/src/providers.spec.ts, apps/gateway/src/lib/anthropic-pricing.spec.ts	Adds an aws-bedrock provider entry for claude-sonnet-5 with pricing, capability flags, reasoning settings, and global/us regions; updates the region expectation test and the Bedrock 1-hour TTL allowlist for the new model prefix.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• theopenco/llmgateway#2547: Both PRs update Anthropic Bedrock region configuration and corresponding providers.spec.ts/getRegionIds expectations.
• theopenco/llmgateway#2806: Both PRs add a Bedrock mapping for claude-sonnet-5 with non-global region support and update providers.spec.ts expected regions.
• theopenco/llmgateway#2193: Both PRs touch Bedrock cache-write billing and 1-hour TTL support behavior used by the anthropic-pricing.spec.ts gating.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding Claude Sonnet 5 support via AWS Bedrock.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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