chore(ai-gateway): remove disabled free KAT-Coder and Seed 2.0 Code models

[chrarnoldus]

Removes the two disabled free Kilo-exclusive models from the codebase:

kwaipilot/kat-coder-pro-v2.5:free

• Deletes providers/streamlake.ts (single-model file holding the disabled model definition)

bytedance-seed/dola-seed-2.0-code:free

• Deletes providers/seed.ts (single-model file holding the disabled model definition)
• Removes the now-unused REASONING_VARIANTS_SEED and the seed branches in getModelVariants/getAiSdkProvider in model-settings.ts

Shared

• Drops both models from kiloExclusiveModels in models.ts
• Adds both public IDs to forbiddenFreeModelIds per the ai-gateway AGENTS.md invariant, so stale clients get the appropriate forbidden-model error from the openrouter route
• Tests: model-api-kinds.test.ts now stubs a disabled catalog model instead of depending on a real provider file; openrouter/index.test.ts uses a synthetic disabled free model mirroring the existing disabledPaidModel pattern

Note: isDeadFreeModel stays as defensive machinery in the openrouter route even though the catalog currently has no disabled models. The BytePlus direct-BYOK dola-seed-2.0-code coding-plan model is a separate paid path and is untouched.

Verification: web package typecheck passes; targeted jest suites for models, model-api-kinds, forbidden-free-models, openrouter, and direct-byok model settings pass (66 tests).

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

Clean, minimal removal of the disabled bytedance-seed/dola-seed-2.0-code:free model, following the same pattern as the earlier kwaipilot/kat-coder-pro-v2.5:free removal, with no dangling references and correct adherence to the ai-gateway forbidden-free-models invariant.

Files Reviewed (6 files)

• apps/web/src/lib/ai-gateway/forbidden-free-models.ts
• apps/web/src/lib/ai-gateway/model-api-kinds.test.ts
• apps/web/src/lib/ai-gateway/models.ts
• apps/web/src/lib/ai-gateway/providers/model-settings.ts
• apps/web/src/lib/ai-gateway/providers/openrouter/index.test.ts
• apps/web/src/lib/ai-gateway/providers/seed.ts (deleted)

Previous Review Summary (commit 94c1454)

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

Previous review (commit 94c1454)

Status: No Issues Found | Recommendation: Merge

Executive Summary

Clean, minimal removal of the disabled kwaipilot/kat-coder-pro-v2.5:free model with no dangling references and correct adherence to the ai-gateway forbidden-free-models invariant.

Files Reviewed (4 files)

• apps/web/src/lib/ai-gateway/forbidden-free-models.ts
• apps/web/src/lib/ai-gateway/models.ts
• apps/web/src/lib/ai-gateway/providers/model-settings.ts
• apps/web/src/lib/ai-gateway/providers/streamlake.ts (deleted)

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_{Reviewed by claude-sonnet-5 · Input: 28 · Output: 7.7K · Cached: 743.1K}

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