Refresh model registry routing

[austin-thesing]

Summary

• Move built-in model catalogs into a dedicated model registry module.
• Refresh OpenCode Zen and OpenRouter model lists with current release-prep entries.
• Add explicit Zen API routing metadata so transport selection no longer relies on model ID prefixes.

Test plan

• bun run typecheck

Summary by CodeRabbit

• Bug Fixes

  • Updated default model selection to improve performance and compatibility.

• Refactor

  • Reorganized model catalog and provider management infrastructure for better maintainability.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 8cd36741-6723-44bf-aac6-0c973e94a223

📥 Commits

Reviewing files that changed from the base of the PR and between f45f9c8 and 6147d26.

📒 Files selected for processing (4)

• src/lib/api.ts
• src/lib/config.ts
• src/lib/models.ts
• src/lib/types.ts

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📝 Walkthrough

Walkthrough

ZenApiType is added to the Model interface in types.ts. All provider model catalog arrays and helper functions are extracted from types.ts into a new src/lib/models.ts file, with types.ts re-exporting them. api.ts switches Zen API routing from string-prefix inference to reading model.zenApiType directly. The default model in config.ts changes from minimax-m2.5-free to deepseek-v4-flash-free.

Changes

Zen API Metadata Routing and Model Catalog Refactor

Layer / File(s)	Summary
ZenApiType type and Model interface extension src/lib/types.ts	Adds the ZenApiType union ("openai-responses" | "anthropic" | "openai-compatible" | "google") and an optional zenApiType field to the Model interface.
Model catalog extraction and re-exports src/lib/models.ts, src/lib/types.ts	New models.ts defines all provider model arrays (OPENROUTER_MODELS, VERCEL_AI_GATEWAY_MODELS, CLOUDFLARE_AI_GATEWAY_MODELS, WORKERS_AI_MODELS, OPENCODE_ZEN_MODELS), the ALL_MODELS aggregate, and getProviderModels/getProviderDisplayName helpers with exhaustive switch statements. types.ts removes its 499-line inline definitions and re-exports the same identifiers from ./models.
Zen API metadata routing and default model update src/lib/api.ts, src/lib/config.ts	getZenApiType now accepts a Model and returns model.zenApiType, throwing on absence instead of inferring from model.id string prefixes. translateToCommand passes the full model object. Default model changed to deepseek-v4-flash-free.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Refresh model registry routing' accurately captures the main objective: refactoring the model registry structure and updating API routing to use explicit metadata instead of ID-based inference.
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 docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release/model-registry-refresh

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