Add protocol list display functionality for container creation

[Copilot]

When users configure additional protocols during container creation, they previously had to guess protocol abbreviations from memory. This enhancement adds the ability to display all available protocols in a formatted, easy-to-read table.

Changes

Before

Enter the protocol abbreviation (e.g, LDAP for Lightweight Directory Access Protocol). Type "e" to exit →  

Users had to guess from 145+ available protocol abbreviations with no way to see what options were available.

After

Enter the protocol abbreviation (e.g, LDAP for Lightweight Directory Access Protocol). Type "list" to see available protocols or "e" to exit →  

When users type list, they now see:

📋 Available Protocols:
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
LDAP         Port 389    (tcp)
MYSQL        Port 3306   (tcp)
POSTGRES     Port 5432   (tcp)
REDIS        Port 6379   (tcp)
MONGO        Port 27017  (tcp)
...
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Implementation

• Added show_available_protocols() function that formats and displays all protocols from the master protocol list
• Enhanced user prompts to include "list" option alongside existing "e" (exit) option
• Added logic to handle "list" command in the protocol selection loop
• Maintains 100% backward compatibility - all existing functionality preserved

Benefits

• No more guessing - Users can easily discover available protocols
• Clear information - Shows protocol abbreviation, port number, and type (tcp/udp)
• Better UX - Reduces friction in container configuration process
• Minimal changes - Surgical enhancement that doesn't disrupt existing workflows

Fixes #44.

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