Minecraft Arclight Egg

[realBritakee]

Description

This PR adds a completely new generic egg for the Arclight hybrid server software, enabling simultaneous execution of Bukkit/Spigot plugins alongside mods on Forge, NeoForge, or Fabric backends.

The submission includes the exported PLCN_v3 egg JSON configuration, an updated main README table, and a dedicated README file for the Arclight directory to ensure proper documentation. The egg has been fully tested and successfully launched a live server instance prior to submission.

Checklist for all submissions

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you tested and reviewed your changes with confidence that everything works?
• Did you branch your changes and PR from that branch and not from your master branch?
  • If not, why?: Done directly from a dedicated feature branch on my fork.

New egg Submissions

1. Does your submission pass tests (server is connectable)?
2. Does your egg use a custom docker image?
   • Have you tried to use a generic image? (Yes, utilizing standard openjdk generic images)
   • Did you PR the necessary changes to make it work?
3. Have you added the egg to the main README.md and any other README files in subdirectories of the egg (e.g /game_eggs) according to the alphabetical order?
4. Have you added a unique README.md for the egg you are adding according to the alphabetical order?
5. You verify that the start command applied does not use a shell script
   • If some script is needed then it is part of a current yolk or a PR to add one
6. The egg was exported from the panel