feat(models): add Claude Opus 4.8

[analogpvt]

Summary

• Adds Claude Opus 4.8 model with anthropic, aws-bedrock, and vertex-anthropic providers
• Same pricing as Opus 4.7: $5/$25 per 1M tokens (tiered: $10/$37.5 over 200K)
• 1M context, 128K max output, adaptive reasoning, vision, tools, web search

Test plan

• pnpm --filter @llmgateway/models build passes
• pnpm --filter gateway build passes
• pnpm --filter api build passes
• E2E: TEST_MODELS="anthropic/claude-opus-4-8" pnpm test:e2e

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features
  • Added support for Claude Opus 4.8 model with adaptive reasoning capabilities for enhanced problem-solving, advanced vision and tool integration, JSON output schema validation for structured responses, integrated web search functionality with dedicated pricing, and comprehensive Anthropic provider support.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: ca51e911-6dbd-44fb-8c64-f3d5276b46df

📥 Commits

Reviewing files that changed from the base of the PR and between f8226e0 and 5044b62.

📒 Files selected for processing (1)

• packages/models/src/models/anthropic.ts

💤 Files with no reviewable changes (1)

• packages/models/src/models/anthropic.ts

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Walkthrough

This PR adds a new claude-opus-4-8 model entry to the anthropic models registry, configuring it with anthropic-only provider support including adaptive reasoning, vision capabilities, JSON schema output support, explicit supported parameters, and web search enabled at a 0.01 price point.

Changes

Claude Opus 4.8 Model Addition

Layer / File(s)	Summary
claude-opus-4-8 model configuration packages/models/src/models/anthropic.ts	New model entry for claude-opus-4-8 with anthropic provider config, including adaptive reasoning with output omission, vision/tools, JSON schema support, explicit supported parameters, pricing, cache write settings, context limits, and web search pricing.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• theopenco/llmgateway#1603: Both PRs extend anthropicModels with new Claude Opus model entries; this PR adds claude-opus-4-8 while the related PR adds/updates claude-opus-4-6.

Suggested reviewers

• steebchen
• smakosh

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'feat(models): add Claude Opus 4.8' clearly and concisely describes the main change: adding a new model entry to the anthropicModels export.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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