Add billing waitlist management

[ManuelCLopes]

Summary

• show a distinct message when a user is already on the billing waitlist
• prevent duplicate waitlist leads by email + plan in API and database migration
• add an admin waitlist page at /admin/waitlist with a sidebar link
• expose /api/admin/billing-waitlist for admins
• keep all new translation keys present across available locales

Tests

• npm test -- client/src/i18n/tests/translationKeys.test.ts
• npm test -- client/src/components/tests/ComingSoonModal.test.tsx server/tests/payments.test.ts server/tests/admin.test.ts

Notes

• npm run check is still blocked locally by existing TypeScript issues: tsconfig ignoreDeprecations=6.0 with the local TS version, plus unrelated chart/resizable type errors when overriding to 5.0.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
radar	Ready	Preview, Comment	Jun 14, 2026 7:45pm

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: d9c7ba7d2d

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".