feat(android): libbox 隧道重写对接真实 1.13.12 API,APK 编译通过(Task 5)

原生层照 PoC 旧/想象 API 写,与真实 sing-box 1.13.12 libbox 差距是架构级:

- 包名 libbox(非 go.libbox);无 BoxService,改 Libbox.setup + CommandServer 模型

- PangolinVpnService 重写:实现完整 PlatformInterface(15法)+CommandServerHandler

- 新增 DefaultNetworkMonitor(上报默认接口,缺则报 no available network)

- openTun 适配真实 TunOptions(RoutePrefixIterator/getMTU/StringBox DNS)

- 统计/切节点经 CommandClient(uplinkTotal/selectOutbound);MainActivity 接线

构建环境矩阵打通:Gradle 8.7(Java21)+声明式插件迁移+AGP 8.6+Kotlin 2.2.0+占位图标

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/android/app/build.gradle

@@ -1,3 +1,9 @@
+plugins {
+    id "com.android.application"
+    id "kotlin-android"
+    id "dev.flutter.flutter-gradle-plugin"
+}
+
 def localProperties = new Properties()
 def localPropertiesFile = rootProject.file('local.properties')
 if (localPropertiesFile.exists()) {
@@ -6,11 +12,6 @@ if (localPropertiesFile.exists()) {
     }
 }
 
-def flutterRoot = localProperties.getProperty('flutter.sdk')
-if (flutterRoot == null) {
-    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
-}
-
 def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
 if (flutterVersionCode == null) {
     flutterVersionCode = '1'
@@ -21,10 +22,6 @@ if (flutterVersionName == null) {
     flutterVersionName = '1.0'
 }
 
-apply plugin: 'com.android.application'
-apply plugin: 'kotlin-android'
-apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
-
 android {
     namespace "com.pangolin.pangolin_vpn"
     compileSdkVersion flutter.compileSdkVersion
@@ -57,17 +54,6 @@ android {
             signingConfig signingConfigs.debug
         }
     }
-
-    // libbox.aar 包含 arm64-v8a / armeabi-v7a / x86_64 三个 ABI；
-    // 若只需调试，可缩减 abiFilters 以加快构建速度。
-    // splits {
-    //     abi {
-    //         enable true
-    //         reset()
-    //         include 'arm64-v8a', 'x86_64'
-    //         universalApk true
-    //     }
-    // }
 }
 
 flutter {
@@ -75,21 +61,15 @@ flutter {
 }
 
 dependencies {
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
-
     // ── sing-box libbox（gomobile AAR）──────────────────────────────
     // 产物由 app/kernel/build-android.sh 生成：
     //   cd app/kernel && ./build-android.sh
-    // 产物路径（相对于本 build.gradle）：../../../app/kernel/dist/android/libbox.aar
-    //
-    // 若文件不存在，构建会报错：请先运行 build-android.sh 生成产物。
-    // 路径说明：client/android/app → ../../.. → repo root → app/kernel/dist/android/
+    // 路径：client/android/app → ../../.. → repo root → app/kernel/dist/android/
+    // Kotlin stdlib 由 kotlin-android 插件自动引入，无需显式声明。
     def libboxAar = file("${projectDir}/../../../app/kernel/dist/android/libbox.aar")
     if (libboxAar.exists()) {
         implementation files(libboxAar)
     } else {
-        // AAR 尚未构建 — 保留占位；IDE 会报红线，但不影响非 libbox 代码编辑。
-        // 运行 `app/kernel/build-android.sh` 后重新 sync 即可。
         logger.warn("⚠  libbox.aar not found at ${libboxAar.absolutePath}")
         logger.warn("   Run: cd app/kernel && ./build-android.sh")
     }