Add backup / restore admin commands

[thebentern]

No description provided.

[ianmcorvidae]

A couple small things, mostly seems good to me though

[ianmcorvidae]

It might be nice if we allow people to pass FLASH and SD here. I think we could do that by trying to parse as an int, and if it fails, throw it at something like admin_pb2.AdminMessage.BackupLocation.__getattr__('FLASH') to convert.

I think this could be done by adding a helper function and passing it as type to these add_argument calls:

def backup_location(string):
    try:
        return int(string)
    except ValueError:
        return admin_pb2.AdminMessage.BackupLocation.__getattr__(string)

I'm a bit tired so hopefully I'm relaying this properly, heh.

[ianmcorvidae]

You probably want default to stay None (that's what's passed if the argument isn't passed on the command line at all) and to set the admin_pb2.<...> value as const (which is what's passed if the argument is passed bare, without a real value).

[Copilot]

Pull Request Overview

This PR adds new admin commands to backup, restore, and remove preference backups, along with updating the project version.

• Updated version in pyproject.toml.
• Added backupPreferences, restorePreferences, and removePreferencesBackups methods in meshtastic/node.py.
• Updated main.py to support new admin commands via argparse.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
pyproject.toml	Version bump to 2.6.0a1 supporting new features.
meshtastic/node.py	Introduced new admin commands for backup/restore actions.
meshtastic/main.py	Extended the CLI with new arguments for backup operations.

[Copilot]

The help message for --restore-prefs is incorrect; it should describe restoring preferences rather than removing backup files. Consider changing it to something like "Tell the destination node to restore preferences from backup. Location: 0 for local flash, 1 for SD card."

Suggested change

	help="Tell the destination node to remove backup preferences files."
	help="Tell the destination node to restore preferences from a backup."