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/slsa.accesswidener

@@ -1,5 +1,6 @@
 accessWidener v1 official
 
 accessible class net/minecraft/world/entity/monster/EnderMan$EndermanTakeBlockGoal
+accessible method net/minecraft/world/entity/Entity unsetRemoved ()V
 accessible field net/minecraft/world/entity/Entity entityData Lnet/minecraft/network/syncher/SynchedEntityData;
-accessible field net/minecraft/server/level/ServerPlayer DATA_PLAYER_MODE_CUSTOMISATION Lnet/minecraft/network/syncher/EntityDataAccessor;
+accessible field net/minecraft/world/entity/Avatar DATA_PLAYER_MODE_CUSTOMISATION Lnet/minecraft/network/syncher/EntityDataAccessor;