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/java/com/github/zly2006/carpetslsaddition/ServerMain.java

@@ -38,6 +38,7 @@ public class ServerMain implements ModInitializer, CarpetExtension {
 
     @Override
     public void onInitialize() {
+        LOGGER.info("[SLSA] onInitialize: managing Carpet extension");
         INSTANCE = this;
         CarpetServer.manageExtension(this);
     }
@@ -75,8 +76,14 @@ public class ServerMain implements ModInitializer, CarpetExtension {
 
     @Override
     public void registerCommands(CommandDispatcher<CommandSourceStack> dispatcher, CommandBuildContext commandBuildContext) {
-        HatCommand.register(dispatcher);
-        SitCommand.register(dispatcher);
-        BotCommand.register(dispatcher);
+        LOGGER.info("[SLSA] registerCommands called!");
+        try {
+            HatCommand.register(dispatcher);
+            SitCommand.register(dispatcher);
+            BotCommand.register(dispatcher);
+            LOGGER.info("[SLSA] commands registered: hat/sit/bot");
+        } catch (Throwable t) {
+            LOGGER.error("[SLSA] failed to register commands", t);
+        }
     }
 }