TIC Meat Shredder

修复锯环和链刃无法铸造的问题：新增金质、沙质和红沙铸模及对应制模、材料铸造配方。锯环消耗4锭材料，链刃消耗8锭；金模可重复使用，沙模一次性消耗。补齐铸模名称、模型和创造栏展示，并支持金模熔回黄金。

Fixed missing casting support for saw rings and chain blades. Added gold, sand and red sand casts, mold creation and material casting recipes. Saw rings cost 4 ingots and chain blades cost 8. Gold casts are reusable and sand casts are consumed. Added cast names, models and creative tab entries, with gold cast recycling.