OptiLite 1.21.4 — TAA + Strong FPS

Based on the uploaded Complementary Reimagined r5.8.1-derived OptiLite build.

Changes:
- TAA enabled (TAA_MODE=1) for cleaner edges, foliage and temporal stability.
- Clouds remain enabled, but CLOUD_QUALITY=1 instead of 2.
  CR's cloud ray-march uses substantially fewer samples at quality 1.
- Shadows stay at the lightweight quality-0 mode.
- SSAO, reflections, light shafts, entity shadows and other expensive
  optional effects remain disabled.

This is intended to recover a significant amount of the ~100 FPS lost
with quality-2 clouds while keeping visible clouds and adding TAA.

For testing: VSync OFF, Max Framerate = Unlimited.
