Zero Two Sky Only UPDATED 1.21.11

This keeps only:
- custom sky layers
- sky character images
- sun/moon/environment sky files

Removed:
- GUI
- item textures
- block textures
- models
- CTM/glass
- animations/lightmaps

Important:
This is still an OptiFine-style sky pack.
For Java + Fabric/Lunar, use it with Skyboxify or Nuit Interop.
Disable the original Zero Two pack while testing this one.

Fixes added:
- duplicated mcpatcher sky files into optifine sky path
- added missing cloud2.png
- added sky0 fallback layer
- added Minecraft 1.21.11 celestial sun/moon fallback paths
- updated pack.mcmeta for 1.21.11
