✨ 添加Java和Kotlin实现的API签名工具，包括核心库、命令行工具和使用文档，支持多种签名算法和环境变量配置。

kotlin/gradle/libs.versions.toml

@@ -0,0 +1,11 @@
+# This file was generated by the Gradle 'init' task.
+# https://docs.gradle.org/current/userguide/platforms.html#sub::toml-dependencies-format
+
+[versions]
+guava = "33.4.5-jre"
+
+[libraries]
+guava = { module = "com.google.guava:guava", version.ref = "guava" }
+
+[plugins]
+kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version = "2.1.20" }