feat(app_zen_box): 初始化安卓端项目配置，完善资源与构建流程

1.  添加安卓端启动图标、启动页资源与配置文件
2.  更新API接口地址为正式服务器地址
3.  调整package.json脚本与依赖项
4.  完善安卓项目构建配置与原生代码
5.  修复剪贴板下载按钮逻辑，改为流式下载

apps/app_zen_box/android/app/proguard-rules.pro

@@ -0,0 +1,14 @@
+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in /usr/local/Cellar/android-sdk/24.3.3/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# react-native-reanimated
+-keep class com.swmansion.reanimated.** { *; }
+-keep class com.facebook.react.turbomodule.** { *; }
+
+# Add any project specific keep options here: