feat: 完整迁移到 Minecraft 26.1.2 / Java 25

- 构建：Loom 1.18-SNAPSHOT、Gradle 9.7.1、official 映射 & - 依赖：carpet 26.1+v260401、fabric-api 0.155.3+26.1.2、fabric-permissions-api 0.7.0 & - 源码：~30 文件 + 28 mixin 从 Yarn 迁移到 Mojang official 映射 & - accessWidener 改为 official 命名空间 & - 适配新 API：Component/ChatFormatting/CommandSourceStack/Commands/ResourceKey/ & ServerLevel/ServerPlayer/Abilities/CraftingRemainingItem/PermissionSet/ValueInput-Output 等 & - 部分功能（elytraCraftable/datapack 注入/offlineFakePlayers）按新 API 近似重写，待实机验证

src/main/resources/slsaddition.mixins.json

@@ -2,7 +2,7 @@
   "required": true,
   "minVersion": "0.8",
   "package": "com.github.zly2006.carpetslsaddition.mixin",
-  "compatibilityLevel": "JAVA_17",
+  "compatibilityLevel": "JAVA_21",
   "client": [
   ],
   "mixins": [
@@ -14,7 +14,7 @@
     "carpet.MixinEntityPlayerMPFake",
     "carpet.MixinPlayerCommand",
     "datapack.MixinVanillaResourcePackProvider",
-    "elytra.MixinElytraItem",
+    "elytra.ItemAccessor",
     "elytra.MixinItem",
     "entity.MixinArmadilloEntity",
     "entity.MixinArmorStandEntity",
@@ -38,4 +38,4 @@
   "injectors": {
     "defaultRequire": 1
   }
-}
+}