Disable DeepSeek discounted models

[chrarnoldus]

Summary

• disable the DeepSeek V4 Pro and V4 Flash discounted models
• document that DeepSeek now has time-of-day based pricing, which our static pricing catalog does not support

Testing

• not run locally; CI will handle verification

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (5 files)

• apps/web/src/lib/ai-gateway/models.test.ts
• apps/web/src/lib/cloud-agent-next/balance-check-eligibility.test.ts
• apps/web/src/lib/cloud-agent-next/balance-check-eligibility.ts
• apps/web/src/lib/model-allow.server.test.ts
• apps/web/src/lib/organizations/effective-model-access.server.test.ts

Previous Review Summary (commit 4f985fb)

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

Previous review (commit 4f985fb)

Status: No Issues Found | Recommendation: Merge

Files Reviewed (5 files)

• apps/web/src/lib/ai-gateway/models.test.ts
• apps/web/src/lib/cloud-agent-next/balance-check-eligibility.test.ts
• apps/web/src/lib/cloud-agent-next/balance-check-eligibility.ts
• apps/web/src/lib/model-allow.server.test.ts
• apps/web/src/lib/organizations/effective-model-access.server.test.ts

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