Create Vanilla+ Integration

Client rendering fixes for Minecraft 1.21.1 / NeoForge 21.1.262. Restores render state after WATUT inventory particles, fixing the reproduced water-colour/transparency change when another player opens their inventory. Anchors JEG weapons to actual zombie, skeleton and pillager hands and restores native gun models in Creative, JEI and inventory slots. Includes the previously developed tractor Workshop.3 assets, workshop parts/recipes, 2D icons, engine sounds, vibration, implements and trailers. Existing weapon damage, boss and quest rules are unchanged from the tested candidate baseline. Automated validation: two real localhost clients, 36 playable gun definitions, 57 GUI screenshots and 1962 applicable pixel checks. No human multiplayer playtest, external shader-pack validation or Iris Xe performance benchmark claimed. Use matching client/server integration versions. Beta release candidate; back up worlds before updating.