keys: add YubiKey (yubi1) age and SSH keys
- Add yubi1 age public key generated with age-plugin-yubikey
- Add yubi1 SSH ed25519-sk public key
- Store SSH private key encrypted with age
- Update ssh-with-age to support age-plugin-yubikey decryption
- Tool now supports Solo 2, Secure Enclave, and YubiKey devices
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