v0.3.0: CI dotnet 8.0.424 pinned with isolated install

- Pin .NET SDK to 8.0.424 in all CI jobs to avoid floating channel drift

- Install SDK to runner temp via DOTNET_INSTALL_DIR to bypass

  C:\\Program Files\\dotnet overwrite/extract conflicts on Gitea Windows runners

- Simplify release job to dotnet publish + upload-artifact

- Exclude memory-bank/ via .gitignore (internal dev memory stays local)

src/RgbLedStripController/RgbLedStripController.csproj

@@ -0,0 +1,41 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net8.0-windows10.0.19041.0</TargetFramework>
+    <UseWPF>true</UseWPF>
+    <UseWindowsForms>true</UseWindowsForms>
+    <Version>0.3.0</Version>
+    <AssemblyVersion>0.3.0.0</AssemblyVersion>
+    <FileVersion>0.3.0.0</FileVersion>
+    <InformationalVersion>0.3.0</InformationalVersion>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <LangVersion>latest</LangVersion>
+    <EnableWindowsTargeting>true</EnableWindowsTargeting>
+    <SupportedOSPlatformVersion>10.0.19041.0</SupportedOSPlatformVersion>
+    <TargetPlatformMinVersion>10.0.19041.0</TargetPlatformMinVersion>
+    <RuntimeIdentifier>win-x64</RuntimeIdentifier>
+    <ApplicationIcon>Assets\AppIcon.ico</ApplicationIcon>
+    <SelfContained>true</SelfContained>
+    <PublishSingleFile>true</PublishSingleFile>
+    <PublishTrimmed>false</PublishTrimmed>
+    <IncludeNativeLibrariesForSelfExtract>true</IncludeNativeLibrariesForSelfExtract>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <StartupObject>RgbLedStripController.App</StartupObject>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ApplicationDefinition Remove="App.xaml" />
+    <Page Include="App.xaml" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Resource Include="Assets\AppIcon.ico" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Velopack" Version="0.0.1298" />
+  </ItemGroup>
+</Project>