Normalize OpenCode Go MPS model IDs

[guillaumegay13]

Summary

• Match opencode-go/<model-id> route model strings against bare modelparams.dev catalog model IDs for OpenCode Go.
• Keep saved route identities unchanged, so existing per-route params remain scoped to the actual Manifest route.
• Add a patch changeset and a focused shared regression test.

Why

The modelparams.dev catalog cannot store slash-delimited model IDs. The companion catalog PR adds provider: opencode-go, model: mimo-v2.5, but Manifest discovers/routes OpenCode Go models as opencode-go/mimo-v2.5. Without this normalization, the catalog row exists but the app cannot load it for the routed model.

Companion catalog PR: mnfst/modelparams.dev#32

Validation

• npm ci
• npm --workspace packages/shared test -- provider-params-spec.spec.ts
• npm --workspace packages/shared run build
• npm --workspace packages/backend test -- model-params.controller.spec.ts proxy.service.spec.ts proxy-fallback.service.spec.ts
• npx eslint packages/shared/src/provider-params-spec.ts
• git diff --check

---

Summary by cubic

Normalize OpenCode Go model IDs so routed IDs like opencode-go/mimo-v2.5 match the catalog’s bare model IDs and load configurable params correctly. Route identities remain unchanged.

• Bug Fixes
  • Strip the opencode-go/ prefix during spec lookup to match modelparams.dev entries.
  • Preserve saved route IDs so per-route params stay scoped to the actual Manifest route.
  • Added a focused regression test and a patch changeset.

^{Written for commit 11c3aa6. Summary will update on new commits. Review in cubic}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.33%. Comparing base (ef76530) to head (11c3aa6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2020   +/-   ##
=======================================
  Coverage   99.33%   99.33%           
=======================================
  Files         182      182           
  Lines       16939    16944    +5     
  Branches     6705     6706    +1     
=======================================
+ Hits        16826    16831    +5     
  Misses        111      111           
  Partials        2        2           

Flag	Coverage Δ
frontend	99.37% <ø> (ø)
shared	97.79% <100.00%> (+0.02%)	⬆️

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[cubic-dev-ai]

No issues found across 3 files

_{Re-trigger cubic}