feat: support Azure user BYOK via Vercel

[chrarnoldus]

Summary

• expose Azure OpenAI as a user BYOK provider for Vercel-backed models
• validate and forward Azure apiKey, resourceName, and optional deployment model mappings
• add masked structured-credential entry and Azure setup guidance to the BYOK UI
• cover Azure credential validation and Vercel request transformation

Verification

• pnpm exec oxfmt on changed files
• git diff --check
• local test suites intentionally not run; CI will handle tests

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• apps/web/src/components/organizations/byok/BYOKKeysManager.tsx
• apps/web/src/routers/byok-router.ts

Previous Review Summaries (2 snapshots, latest commit f68acd3)

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

Previous review (commit f68acd3)

Status: No Issues Found | Recommendation: Merge

Files Reviewed (3 files)

• apps/web/src/components/organizations/byok/BYOKKeysManager.tsx
• apps/web/src/lib/ai-gateway/providers/vercel/index.ts
• apps/web/src/routers/byok-router.ts

Previous review (commit dcbd9ac)

Status: No Issues Found | Recommendation: Merge

Files Reviewed (8 files)

• apps/web/src/components/organizations/byok/BYOKKeysManager.tsx
• apps/web/src/lib/ai-gateway/providers/openrouter/inference-provider-id.test.ts
• apps/web/src/lib/ai-gateway/providers/openrouter/inference-provider-id.ts
• apps/web/src/lib/ai-gateway/providers/openrouter/types.ts
• apps/web/src/lib/ai-gateway/providers/vercel/index.test.ts
• apps/web/src/lib/ai-gateway/providers/vercel/index.ts
• apps/web/src/routers/byok-router.test.ts
• apps/web/src/routers/byok-router.ts

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_{Reviewed by grok-4.6 · Input: 54.4K · Output: 6.2K · Cached: 155.1K}

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