feat: implement TCP port scanner via bot button

[by-cortex]

Add a reply button to list all currently open (listening) TCP ports and the associated processes.

• Reply button in main menu: 📋 Ports
• Should return a list like:
  • 🔌 80/tcp — nginx
  • 🔌 22/tcp — sshd
  • 🔌 5432/tcp — postgres
• Use psutil, lsof, or netstat to fetch open ports and owning process names
• Show only listening TCP ports (LISTEN state)

💡 Optional

• Add flag to list UDP ports too
• Display process PID (optional)

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🛠️ Difficulty: Medium
🤝 Good for contributors interested in system introspection