refa: admin cert command

[jonaro00]

No description provided.

[greptile-apps]

PR Summary

This PR refactors the admin certificate renewal system, implementing individual certificate processing with rate limiting and improved type safety.

• Added rate limiting in /admin/src/lib.rs with 1-second delays between certificate renewals to prevent API throttling
• Refactored /admin/src/client.rs to split certificate operations into get_old_certificates() and renew_certificate() for better control
• Potential issue: Usage of unwrap() in /admin/src/lib.rs for async operations could cause panics on API failures

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