Add architecture field to agent deployment commands

[clenk]

Description

Adds an architecture field to manx agent deployment commands. This makes it easier to compile for non-x86-64 systems such as recent Macs.

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Ran the server, opened the modal and inspected visually.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

[Copilot]

Pull request overview

Adds support for selecting a target CPU architecture when downloading/compiling the Manx agent via the deployment commands, enabling easier use on non-x86_64 systems (e.g., Apple Silicon).

Changes:

• Adds an architecture header to the Darwin/Linux curl download commands.
• Adds an architecture header to the Windows PowerShell WebClient download commands.

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