Add an app selector for per-app proxy; Add Simplified Chinese translation

[SwimmingTiger]

Change 1

Added an app selector for the per-app proxy, no need to manually enter the package name.

Features:

• The application will not crash when upgrading from the old version, but the package name manually filled in by the user cannot be retained.

• If you choose some apps, when you open the selector next time, the selected app will automatically appear at the top of the list, making it easy to uncheck.

  

• When multiple applications have the same name, automatically add the package name as a suffix.

  

• The change is compatible with Android 5.0 (tested in the Android emulator) and Android 11 (tested in my Xiaomi mi 10pro).