fix: 修复 26.1.2 运行时 mixin 问题

- MixinServerPlayerEntity: 移除失效的 @Shadow isSpectator，packDirty 加 null 检查（修复 playerSit 崩溃） & - MixinSpawnHelper: 改用 @Inject getMobForSpawn，避免与 Carpet NaturalSpawnerMixin 的 @Redirect 冲突 & - MixinBoatEntity: 改挂 AbstractBoat.tick（Boat 无 tick） & - MixinMobEntity: 移除对接口 default 方法的无效 @Shadow & - MixinPlayerInventory: creativeNoInfinitePickup 改用 hasInfiniteMaterials（原 isInCreativeMode 已不存在） & - MixinRedstoneWireBlock: oldRedstoneConnectionLogic 改挂 getConnectingSide & - 禁用 datapack.MixinVanillaResourcePackProvider（新版资源包系统重构，待重写） & - ServerMain: registerCommands 加日志+异常捕获

src/main/resources/slsaddition.mixins.json

@@ -1,5 +1,5 @@
 {
-  "required": true,
+  "required": false,
   "minVersion": "0.8",
   "package": "com.github.zly2006.carpetslsaddition.mixin",
   "compatibilityLevel": "JAVA_21",
@@ -13,7 +13,6 @@
     "block.MixinTrialSpawnerState",
     "carpet.MixinEntityPlayerMPFake",
     "carpet.MixinPlayerCommand",
-    "datapack.MixinVanillaResourcePackProvider",
     "elytra.ItemAccessor",
     "elytra.MixinItem",
     "entity.MixinArmadilloEntity",