feat: read costs per model

[JCHacking]

Summary

Initial implementation to read the cost of the models

Type of change

• 🐛 Bug fix (non-breaking)
• ✨ New feature (non-breaking)
• 💥 Breaking change
• 📝 Documentation only
• 🔧 Internal / refactor

Checklist

• npm run typecheck passes
• No new runtime dependencies (or justified in this PR description)
• README updated if public API or behavior changed
• CHANGELOG.md updated under ## [Unreleased]
• Commit messages follow Conventional Commits

How was this tested?

I tested it on my OpenCode with Litellm, and the costs displayed correctly.

Screenshots / logs (optional)

Summary by CodeRabbit

• New Features

  • Added model pricing details for input, output, and cached tokens.
  • Pricing is now displayed per million tokens when available.
  • Pricing metadata is enriched from additional model configuration details.

• Bug Fixes

  • Improved handling of missing or zero pricing data.
  • Model discovery continues successfully when pricing information is unavailable, defaulting costs to zero.

[coderabbitai]

📝 Walkthrough

Walkthrough

Model discovery now retrieves /v1/model/info metadata, enriches missing pricing fields, and maps input, output, and cache token costs into OpenCode models with zero-value fallbacks.

Changes

Model cost discovery and mapping

Layer / File(s)	Summary
Cost metadata contract and enrichment src/types/index.ts, src/utils/litellm-api.ts	Adds optional token-cost fields to LiteLLMModelInfo and fills missing values from litellm_params.
Discovery pipeline and V2 model mapping src/plugin/discover.ts, src/plugin/build-model.ts	Runs model and model-info discovery concurrently, tolerates model-info failures, and maps discovered costs into V2 models using per-million-token scaling.
Config model mapping and release note src/plugin/index.ts, CHANGELOG.md	Passes model-info data into config conversion, maps scaled token and cache costs, and documents the new /v1/model/info cost source.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Sequence Diagram(s)

sequenceDiagram
  participant discoverBucket
  participant LiteLLM
  participant buildModelV2
  participant OpenCodeModel
  discoverBucket->>LiteLLM: discoverLiteLLMModels()
  discoverBucket->>LiteLLM: discoverLiteLLMModelInfo()
  LiteLLM-->>discoverBucket: models and cost metadata
  discoverBucket->>buildModelV2: model and LiteLLMModelInfo
  buildModelV2->>OpenCodeModel: create scaled input/output/cache costs

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Possibly related PRs

• yuseferi/opencode-litellm#10: Extends the same /v1/model/info enrichment pipeline and cost-field mapping.

Suggested reviewers: yuseferi

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title is concise and clearly describes the main change: reading per-model costs.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[yuseferi]

Sorry, I reviewed the other one first mistakenly and both are doing the same!
It's already merged!
#16

Thanks for your contribution, and looking forward for your next PR <3