Fix Dendrix website link on gateway auth page

[dankritz]

Summary

• Updates the gateway password page Dendrix AI link to https://www.dendrix-ai.com.
• Updates the branded gateway page regression test to match the canonical website URL.

Validation

• npm run typecheck
• npm test --workspace @vibestack/api
• npm run build --workspace @vibestack/api
• git diff --check

Publication note

After merge, publish nightly to the merged commit and rebuild the live server.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• apps/api/src/server.test.ts
• apps/api/src/server.ts

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_{Reviewed by grok-code-fast-1 · 78,367 tokens}