build: 集成 Spotless 8.5.1 代码格式化工具

- 在版本目录中添加 spotless 插件 8.5.1
- 配置 Kotlin 源码和 Gradle Kotlin DSL 脚本格式化
- 使用 ktlint 引擎，启用 trimTrailingWhitespace 和 endWithNewline

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

build.gradle.kts

@@ -4,4 +4,21 @@ plugins {
     alias(libs.plugins.androidApplication) apply false
     alias(libs.plugins.androidLibrary) apply false
     alias(libs.plugins.composeCompiler) apply false
-}
+    alias(libs.plugins.spotless)
+}
+
+spotless {
+    kotlin {
+        target("src/**/*.kt")
+        targetExclude("${layout.buildDirectory}/**/*.kt")
+        ktlint()
+        trimTrailingWhitespace()
+        endWithNewline()
+    }
+    kotlinGradle {
+        target("*.gradle.kts")
+        ktlint()
+        trimTrailingWhitespace()
+        endWithNewline()
+    }
+}

gradle/libs.versions.toml

@@ -1,5 +1,6 @@
 [versions]
 agp = "9.2.1"
+spotless = "8.5.1"
 android-compileSdk = "37"
 android-minSdk = "24"
 android-targetSdk = "37"
@@ -47,3 +48,4 @@ androidLibrary = { id = "com.android.library", version.ref = "agp" }
 composeCompiler = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }
 androidTest = { id = "com.android.test", version.ref = "agp" }
 kotlinAndroid = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
+spotless = { id = "com.diffplug.spotless", version.ref = "spotless" }

settings.gradle.kts

@@ -30,4 +30,4 @@ dependencyResolutionManagement {
 
 include(":core")
 include(":app")
-include(":macrobenchmark")
+include(":macrobenchmark")