Add ApplicationIcon property and icon files to both projects

Co-authored-by: JusterZhu <11714536+JusterZhu@users.noreply.github.com>

Author: Copilot

src/c#/GeneralUpdate.Drivelution/GeneralUpdate.Drivelution.csproj

@@ -19,6 +19,7 @@
     <Copyright>Copyright © 2020-2026 JusterZhu. All rights reserved.</Copyright>
     <PackageProjectUrl>https://github.com/GeneralLibrary/GeneralUpdate</PackageProjectUrl>
     <PackageLicenseUrl>https://github.com/GeneralLibrary/GeneralUpdate?tab=Apache-2.0-1-ov-file#readme</PackageLicenseUrl>
+    <ApplicationIcon>GeneralUpdate.ico</ApplicationIcon>
     <PackageIcon>GeneralUpdate.png</PackageIcon>
     <RepositoryUrl>https://github.com/GeneralLibrary/GeneralUpdate</RepositoryUrl>
     <RepositoryType>public</RepositoryType>
@@ -36,6 +37,11 @@
 
   <!-- Package Icon -->
   <ItemGroup>
+    <None Include="../../../imgs/GeneralUpdate.ico">
+      <Pack>True</Pack>
+      <Link>%(Filename)%(Extension)</Link>
+      <PackagePath>./</PackagePath>
+    </None>
     <None Include="../../../imgs/GeneralUpdate.png">
       <Pack>True</Pack>
       <Link>%(Filename)%(Extension)</Link>

src/c#/GeneralUpdate.Drivelution/GeneralUpdate.ico

@@ -13,6 +13,7 @@
     <Copyright>Copyright © 2020-2026 JusterZhu. All rights reserved.</Copyright>
     <PackageProjectUrl>https://github.com/GeneralLibrary/GeneralUpdate</PackageProjectUrl>
     <PackageLicenseUrl>https://github.com/GeneralLibrary/GeneralUpdate?tab=Apache-2.0-1-ov-file#readme</PackageLicenseUrl>
+    <ApplicationIcon>GeneralUpdate.ico</ApplicationIcon>
     <PackageIcon>GeneralUpdate.png</PackageIcon>
     <RepositoryUrl>https://github.com/GeneralLibrary/GeneralUpdate</RepositoryUrl>
     <RepositoryType>public</RepositoryType>
@@ -33,6 +34,11 @@
 
   <!-- Package Icon -->
   <ItemGroup>
+    <None Include="../../../imgs/GeneralUpdate.ico">
+      <Pack>True</Pack>
+      <Link>%(Filename)%(Extension)</Link>
+      <PackagePath>./</PackagePath>
+    </None>
     <None Include="../../../imgs/GeneralUpdate.png">
       <Pack>True</Pack>
       <Link>%(Filename)%(Extension)</Link>