feat: use laptop hostname in instance names and display instance info

[yossiovadia]

Summary

Improves instance naming and deployment feedback by using the operator's laptop hostname instead of a generic "GPU-Instance" prefix and displaying comprehensive instance information upon deployment completion.

Changes Made

• Instance Naming: Replace GPU-Instance with ansible_hostname in instance naming to make instances more identifiable by operator
• Deployment Summary: Add comprehensive instance information display at deployment completion including:
  • Instance ID and Name
  • Instance Type and IPs (public/private)
  • Ready-to-use SSH command
  • Details file location

Benefits

• Better instance identification and management when multiple operators are using the provisioner
• Immediate access to connection information without needing to check separate files
• Improved user experience with clear deployment completion feedback

Testing

• ✅ Verified instance naming works with laptop hostname
• ✅ Confirmed deployment summary displays all relevant information
• ✅ SSH command generation works correctly