[Feat] Check for updates automatically

[RichardAnderson]

This pull request introduces a new scheduled process to check for package updates on all servers and improves the accuracy of update counting. The main changes include adding a new Artisan command and job for checking updates, scheduling this check to run daily, and refining the logic for determining the number of available updates.

• Modified the logic in OS.php to accurately count available updates by removing an unnecessary subtraction, ensuring the number does not go below zero.
• Updated the shell command in available-updates.blade.php to filter out the header line and suppress error output, providing a more accurate count of upgradable packages.

[Copilot]

Pull request overview

This PR adds an automated daily “check for package updates” workflow across all READY servers and updates the SSH parsing/counting logic used to compute the number of available OS package upgrades.

Changes:

• Add servers:check-updates Artisan command plus a queued job (CheckForUpdatesJob) to run per-server update checks and broadcast server.updated.
• Schedule the new command to run daily at 02:00.
• Refine available-updates counting by adjusting the SSH script output and simplifying the parsing logic in OS::availableUpdates().

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
resources/views/ssh/os/available-updates.blade.php	Adjusts the apt command pipeline used to count upgradable packages.
app/SSH/OS/OS.php	Updates parsing/counting logic for “Available updates:” output.
app/Jobs/Server/CheckForUpdatesJob.php	Introduces a queued job that runs update checks and broadcasts server updates.
app/Console/Kernel.php	Schedules the new servers:check-updates command daily.
app/Console/Commands/CheckServerUpdatesCommand.php	Adds a command that dispatches per-server update-check jobs for READY servers.