refactor(core): 优化 FriendlyByteBuf 类中的 long 数组读取方法

- 修改 readLongArray 方法的参数声明，提高代码可读性
- 保持功能和逻辑不变，仅调整参数类型标注

core/src/main/java/net/momirealms/craftengine/core/util/FriendlyByteBuf.java

@@ -221,11 +221,11 @@ public class FriendlyByteBuf extends ByteBuf {
         return this.readLongArray(null);
     }
 
-    public long[] readLongArray(@Nullable long[] toArray) {
+    public long[] readLongArray(long @Nullable [] toArray) {
         return this.readLongArray(toArray, this.readableBytes() / 8);
     }
 
-    public long[] readLongArray(@Nullable long[] toArray, int maxSize) {
+    public long[] readLongArray(long @Nullable [] toArray, int maxSize) {
         int arraySize = this.readVarInt();
         if (toArray == null || toArray.length != arraySize) {
             if (arraySize > maxSize) {