feat(ai-gateway): add MiniMax M3 to Auto Free

[johnnyeric]

Summary

• Add MiniMax M3 and MiniMax M2.7 free GMI Cloud models to Auto Free.
• Include both models in the Recommended group exposed to CLI and VS Code clients.
• Rebalance Auto Free selection weights to keep StepFun at 50% and each remaining candidate at 12.5%.
• Align the advertised Auto Free context length with the smallest included candidate.

Verification

• Started the cloud backend locally and launched the Kilo CLI against it with isolated temporary XDG state.
• Opened the CLI model selector and confirmed MiniMax M3 and MiniMax M2.7 appear in the Recommended group.

Visual Changes

Before

After

Hy3 shows in the image because I screenshotted it before rebasing.

Reviewer Notes

Rebased onto main after #5764 disabled Tencent Hy3. Hy3 remains disabled and excluded from Auto Free and Recommended. The active Auto Free distribution totals 100%: StepFun has weight 4 (50%), while Laguna, LongCat, MiniMax M3, and MiniMax M2.7 each have weight 1 (12.5%). The quarantine routing path intentionally retains its previous behavior; the unrelated organization-policy issue found during review is outside this PR's scope.

Local automated verification: formatting passed, targeted lint passed with zero warnings, web TypeScript passed, and models.test.ts passed all 42 tests.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• apps/web/src/lib/ai-gateway/models.ts
• apps/web/src/lib/ai-gateway/models.test.ts

Previous Review Summary (commit 80eedc5)

Current summary above is authoritative. Previous snapshots are kept for context only.

Previous review (commit 80eedc5)

Status: No Issues Found | Recommendation: Merge

Files Reviewed (3 files)

• apps/web/src/lib/ai-gateway/auto-model/index.ts
• apps/web/src/lib/ai-gateway/models.ts
• apps/web/src/lib/ai-gateway/models.test.ts

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_{Review guidance: REVIEW.md from base branch main}