feat: close wave batch for issues #637-640

[kike-alt]

Closes #637
Closes #638
Closes #639
Closes #640

Summary

• add webhook endpoints, queued delivery, and delivery history
• add support tickets with admin updates and notification emails
• add admin stats with cache invalidation and IP allowlisting
• add cached exchange rate and supported currency endpoints

Testing

• npm run build
• npx eslint on touched source and test files
• npx jest --runInBand --watchman=false src/auth/auth.service.spec.ts src/transactions/transactions.service.spec.ts src/wallet/wallets.service.spec.ts src/common/guards/ip-allowlist.guard.spec.ts src/support/support-tickets.service.spec.ts

[drips-wave]

@kike-alt Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

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