RED-302: Set Password Command Fails to Change Password Despite Valid Input

[dnlbui]

https://linear.app/shm/issue/RED-302/[new-validator-gui]-set-password-command-fails-to-change-password
Fix password set with $, enhance security, update readme

Summary: Enhance password setting security and usability

• Implement interactive mode to remove password from command-line arguments to avoid shell misinterpretation with special characters (i.e. $)
  • also prevents exposure in history and logs when using interactive mode
• Add non-interactive mode for scripted password setting via piped input to avoid shell misinterpretation
  • More secure than command-line arguments (not visible in process lists)
• Maintain compatibility with existing systems while improving security
• added success log after password is set