fix: Lifter.Maui targets only .NET 9 (workload limitations on CI)

- Removed net8.0 MAUI targets (android, ios, maccatalyst)
- iOS workload packs for .NET 8 MAUI not available on Linux CI runners
- Lifter.Core, Avalonia, Blazor still support .NET 8+
- Lifter.Maui requires .NET 9+

Author: mrdevrobot

Lifter.Maui/Lifter.Maui.csproj

@@ -1,8 +1,9 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <!-- Multi-targeting for .NET MAUI on .NET 8 and .NET 9 -->
-    <TargetFrameworks>net8.0-android;net8.0-ios;net8.0-maccatalyst;net9.0-android;net9.0-ios;net9.0-maccatalyst;net9.0-windows10.0.19041.0</TargetFrameworks>
+    <!-- Multi-targeting for .NET MAUI on .NET 9 only -->
+    <!-- Note: net8.0 MAUI workloads (especially iOS) are not reliably available on Linux CI runners -->
+    <TargetFrameworks>net9.0-android;net9.0-ios;net9.0-maccatalyst;net9.0-windows10.0.19041.0</TargetFrameworks>
     <UseMaui>true</UseMaui>
     <SingleProject>true</SingleProject>
     <ImplicitUsings>enable</ImplicitUsings>