Fix dynamic protocol routing for discovered models

[yourcasualdev]

Summary

• enrich CLIProxyAPI model discovery with dynamic provider/model protocol metadata from models.dev
• route Anthropic-compatible models through @ai-sdk/anthropic and /v1/messages without hardcoded model IDs
• keep the configured default protocol when metadata is unavailable or specifies another SDK
• preserve discovered routing metadata when merging user model customization

Validation

• bun run check — 14 tests, typecheck, and build pass
• local OpenCode smoke test: grok-4.5 returned OK through /v1/chat/completions
• local OpenCode routing test: minimax-m2.5 reached /v1/messages (upstream Go keys returned 401 and were suspended separately)

Closes #1

[yourcasualdev]

Local OpenCode review

Reviewed git diff main...HEAD with cliproxyapi/gpt-5.6-sol in a bounded read-only reviewer.

Standards

None.

Spec

None.

Verdict: APPROVE

The reviewer checked CONTRIBUTING.md, issue #1, the implementation and tests, and the live models.dev provider/model metadata shape. No files were changed by the review.