Resolve Android CI compile break from namespace/type collisions in AndroidApkInstaller

[Copilot]

Recent CI runs failed in the Android target due to symbol resolution conflicts introduced in AndroidApkInstaller (Android.*/Java.IO.* identifiers colliding with the project namespace and BCL types). This PR scopes Android/Java references explicitly so the Android build compiles deterministically.

• Changes

  • AndroidApkInstaller import and symbol disambiguation
    • Replaced broad Android/Java usings with explicit aliases:
      • AndroidApp, AndroidContent, AndroidNet, AndroidOS, JavaFile
    • Updated call sites to use aliased namespaces/types (Application.Context, Intent, ActivityFlags, Uri, BuildVersionCodes).
  • Exception/file type conflict fix
    • Qualified FileNotFoundException as System.IO.FileNotFoundException.
    • Replaced ambiguous File/Uri references with JavaFile / AndroidNet.Uri.

• Representative diff pattern

  #if ANDROID
  using AndroidApp = Android.App;
  using AndroidContent = Android.Content;
  using AndroidNet = Android.Net;
  using AndroidOS = Android.OS;
  using JavaFile = Java.IO.File;
  #endif
  
  var context = AndroidApp.Application.Context;
  var apkFile = new JavaFile(apkFilePath);
  AndroidNet.Uri apkUri = AndroidNet.Uri.FromFile(apkFile);
  throw new System.IO.FileNotFoundException("APK file was not found.", apkFilePath);

Original prompt

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This section details on the original issue you should resolve

<issue_title>CI/DI error</issue_title>
<issue_description>Please check the cause of the error and fix it.
https://github.com/GeneralLibrary/GeneralUpdate.Maui/actions/runs/23427212372/job/68144624765</issue_description>

<agent_instructions>请充分理解仓库代码、issue上下文，并修复问题。</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@JusterZhu Please check the cause of the error and fix it. https://github.com/GeneralLibrary/GeneralUpdate.Maui/actions/runs/23428739300/job/68149550278

• Fixes CI/DI error #4

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[Copilot]

Pull request overview

This PR addresses CI build failures in the GeneralUpdate.Maui.Android project by removing Android/Java namespace and type ambiguities in the APK installation implementation.

Changes:

• Introduces explicit namespace/type aliases for Android and Java namespaces to avoid ambiguous references.
• Fully-qualifies System.IO.FileNotFoundException to prevent clashes with Java IO types.
• Updates Android API usages (Build, Intent, Uri, Application) to use the new aliases consistently.

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