docs: 添加管理平台标准加密算法 Kotlin 参考实现

docs/工具箱端-授权对接指南/utils/DistributedIdUtil.kt

@@ -0,0 +1,12 @@
+package top.tangyh.lamp.filing.utils
+
+object DistributedIdUtil {
+    fun generateId(platformId: Long, localId: Long): Long {
+        require(platformId in 0..0xFFFF) { "platformId must be 0-65535" }
+        val safeLocalId = localId and 0xFFFFFFFFFFFF
+        return (platformId shl 48) or safeLocalId
+    }
+
+    fun parsePlatform(id: Long): Long = id ushr 48
+    fun parseLocal(id: Long): Long = id and 0xFFFFFFFFFFFF
+}