fix: refresh MiniMax-M3 flat pricing

[octo-patch]

Reason: MiniMax-M3 pricing still uses obsolete context and service tiers, causing the picker and usage estimates to show incorrect rates.

Update MiniMax-M3 to flat per-million-token rates of $0.60 input, $2.40 output, and $0.12 cache reads. Clear the tier overrides so the existing picker and usage cost calculation consume those rates.

Validation:

• npm run test:loop: all 83 tests passed.
• Executed the pricing lookup against the supplied MiniMax model rates: 30 combinations of model, context size, and service tier passed.
• git diff --check passed.
• Secret scan passed.

Summary by CodeRabbit

• Updates
  • Updated MiniMax-M3 pricing rates.
  • Removed service-tier pricing options; pricing now uses the model’s standard rates.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 598a27ba-d3f1-4025-9cc7-f1a70b7fb481

📥 Commits

Reviewing files that changed from the base of the PR and between 2980105 and be7a6df.

📒 Files selected for processing (1)

• src/utils/model/providers.ts

Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review.

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📝 Walkthrough

Walkthrough

Changes

MiniMax pricing

Layer / File(s)	Summary
Update MiniMax-M3 pricing src/utils/model/providers.ts	The base input, output, and cache-read rates double. The four service-tier pricing entries are removed, so getMiniMaxPricing uses the base pricing.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to be7a6

The updated MiniMax-M3 rates are consistently used for cost calculations and model pricing labels, with no concrete merge-blocking risk identified.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: updating MiniMax-M3 to flat pricing rates.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
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.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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