AnubisCraft: Redone 1.16.6 - Structure and JEI Loading Optimizations

- Added Structure Layout Optimizer 1.0.11 for Forge 1.20.1 to improve jigsaw structure layout generation and reduce structure-template overhead.
- Added Just Enough Threads 0.9.1 to the player pack as an experimental client-side JEI startup optimization.
- Just Enough Threads is intentionally excluded from the dedicated server because it is client-only.
- Retained Ksyxis, ModernFix, Smooth Boot, FastSuite and the existing performance suite.
- Updated player and dedicated-server version labels to 1.16.6.
- No quests, quest IDs, task IDs, rewards or progression content were changed or removed.

Compatibility note:
Just Enough Threads requires Forge 47.4.4 or newer and JEI 15.20.0.120 or newer. This pack uses Forge 47.4.10 and a compatible JEI build. If JEI behaves incorrectly after entering a world, disable Just Enough Threads in config/jei_optimize-client.toml.
