feat: add MiniMax-M2.7 and MiniMax-M2.7-highspeed model support

[octo-patch]

Summary

• Add MiniMax-M2.7 and MiniMax-M2.7-highspeed to KNOWN_ALIASES in model-name-normalizer.ts for mixed-case model name resolution
• Add both models to minimax.knownModels in packages/shared/src/subscription/configs.ts so they appear as known models for the MiniMax Coding Plan subscription
• Add minimax-m2.7 and minimax-m2.7-highspeed to the curated model allowlist in PurgeNonCuratedModels migration so they survive the DB cleanup pass
• Update MiniMax provider subtitle in the frontend to reflect M2.7 as the latest model
• Extend existing tests to cover M2.7 alias resolution and known-models inclusion

MiniMax-M2.7 is MiniMax's newest flagship model (Peak Performance. Ultimate Value. Master the Complex). MiniMax-M2.7-highspeed is the faster variant. Without these entries the model names returned by the MiniMax API are not normalized correctly and would be filtered out by the curated-models migration.

Test plan

• npm test --workspace=packages/shared — all tests pass (68 total)
• npm test --workspace=packages/backend -- --testPathPattern="model-name-normalizer|PurgeNonCuratedModels" — all tests pass (66 total)
• npm test --workspace=packages/frontend -- providers.test.ts — all tests pass (67 total)
• MiniMax-M2.7 resolves correctly when used as a routing model name
• MiniMax-M2.7-highspeed appears in the known-models list for the MiniMax Coding Plan subscription

---

Summary by cubic

Adds support for MiniMax-M2.7 and MiniMax-M2.7-highspeed. Models are normalized, appear in MiniMax subscription and fallbacks, survive the curated-models migration, and the provider subtitle now highlights M2.7.

• New Features

  • Added mixed-case aliases to KNOWN_ALIASES for MiniMax-M2.7 and MiniMax-M2.7-highspeed.
  • Included both models in MiniMax subscription knownModels.
  • Added minimax-m2.7 and minimax-m2.7-highspeed to the curated allowlist in PurgeNonCuratedModels.
  • Updated MiniMax provider subtitle; extended tests for alias resolution and known-models.

• Bug Fixes

  • Updated subscription fallback test to expect MiniMax-M2.7 and MiniMax-M2.7-highspeed.

^{Written for commit 4227122. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 7 files

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.01%. Comparing base (acd3284) to head (4227122).
⚠️ Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1570      +/-   ##
==========================================
+ Coverage   97.94%   98.01%   +0.06%     
==========================================
  Files         118      119       +1     
  Lines        8616     8967     +351     
  Branches     3242     3372     +130     
==========================================
+ Hits         8439     8789     +350     
- Misses        175      176       +1     
  Partials        2        2              

Flag	Coverage Δ
frontend	98.00% <100.00%> (+0.06%)	⬆️
shared	100.00% <ø> (ø)

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