feat: add utilizedRAM metric

[owennewo-dev]

Added an availableRAM metric to the heartbeat, and updated the UI. Let me know how the glowing text makes you feel, I'll change it if it doesn't align with your style expectations.

Huge thanks to @fccview for refactoring the code! It is super easy to work on now.

[fccview]

So given the addition of #20 and #9 we need to make sure we don't clutter the screen with things and keep that nice minimal counter going as it's the core of the application

Would you rather

• Have an env var to enable that ram message and keep it as is for the meme
• Have the ram message in the modal with the other diagnostics - maybe we have the money value in green as it's hilarious
• Wait until I build a drag/drop modal system to have all elements you want to enable floating on screen and have a button to toggle the available ram modal on

Let me know, we can work together on this ❤️

[WimmoX]

Great work!! Really curious how vast the unused RAM pool is! Currently, I'm the only one running this branche I think 😆

[owennewo-dev]

Updated the metric.

It is now optional, enable it with the RAM_USAGE=true .env variable