restructure to go structure

cmd/plt-build/build.gradle.kts

@@ -0,0 +1,30 @@
+plugins {
+    kotlin("jvm") version "2.2.10"
+    kotlin("plugin.serialization") version "2.2.20"
+}
+
+group = "moe.rosa"
+version = "0.1.0"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation(platform("org.junit:junit-bom:5.10.0"))
+    testImplementation("org.junit.jupiter:junit-jupiter")
+    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+
+    testImplementation(kotlin("test"))
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.9.0")
+    implementation(kotlin("reflect"))
+}
+
+kotlin {
+    jvmToolchain(24)
+}
+
+tasks.test {
+    useJUnitPlatform()
+}
+project.layout.buildDirectory.set(file("../build"))