[IMP] allow LAN printing and manage firewall rules

[djip-odoo]

• Allow devices on the local network to trigger printing
• Configure firewall rules when LAN access is enabled

task-6306338

[jipr-odoo]

Wouldn't it be better to request firewall permission only when the user explicitly enables "Allow Network Printing" instead of prompting on the first launch? This avoids showing an elevation/UAC prompt to users who may never use network printing and keeps the permission request contextual.

[jipr-odoo]

OldPort is updated whenever prompt is true, even if the firewall configuration was cancelled or failed. Would it make more sense to update OldPort only after the firewall rule has been successfully configured?

[jipr-odoo]

One more (rare) case that I think we should handle:

If the user enables network access and later changes the printer port, printing will stop working, but the UI will still indicate that network printing is allowed. That can be misleading.

I suggest resetting the "Allow Network Printing" flag to false whenever the port changes, so the user is prompted to enable firewall access again for the new port.

[davidmonnom]

We'll not tweak the device firewall from the application, the user should do it by himself.