✨ Implement sshctl key generate command

[AndreLeclercq]

Goal

Add a command to generate SSH keys interactively.

Command

sshctl key generate <key-name>

Features

• Interactive prompts for:
  • Key type selection (Ed25519, RSA-4096, RSA-2048, ECDSA)
  • Passphrase (optional)
  • Save path (default: ~/.ssh/)
• Use ssh-keygen under the hood
• Clear success message with key location
• Proper error handling (ssh-keygen not found, key exists, permission denied)

Example Usage

  $ sshctl key generate github-personal
  # Interactive prompts...
  ✓ SSH key pair generated successfully!
    Private key: ~/.ssh/github-personal
    Public key:  ~/.ssh/github-personal.pub