Add MrTrust GUI and Gitea release build

scripts/Build-MrTrustExe.ps1

@@ -0,0 +1,50 @@
+[CmdletBinding()]
+param(
+    [string]$OutputPath = ".\dist\MrTrust.exe"
+)
+
+$ErrorActionPreference = "Stop"
+
+function Resolve-FullPath {
+    param([Parameter(Mandatory)][string]$Path)
+
+    $executionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath($Path)
+}
+
+$root = Split-Path -Parent (Split-Path -Parent $MyInvocation.MyCommand.Path)
+$sourcePath = Join-Path $root "src\MrTrustLauncher.cs"
+$resolvedOutputPath = Resolve-FullPath $OutputPath
+$outputDirectory = Split-Path -Parent $resolvedOutputPath
+
+if (-not (Test-Path -LiteralPath $sourcePath)) {
+    throw "Launcher source not found: $sourcePath"
+}
+
+New-Item -ItemType Directory -Force -Path $outputDirectory | Out-Null
+
+$compilerCandidates = @(
+    "$env:WINDIR\Microsoft.NET\Framework64\v4.0.30319\csc.exe",
+    "$env:WINDIR\Microsoft.NET\Framework\v4.0.30319\csc.exe"
+)
+
+$compiler = $compilerCandidates | Where-Object { Test-Path -LiteralPath $_ } | Select-Object -First 1
+if (-not $compiler) {
+    throw "csc.exe was not found. Run this build on a Windows Gitea runner with .NET Framework installed."
+}
+
+& $compiler `
+    /nologo `
+    /target:winexe `
+    /optimize+ `
+    /platform:anycpu `
+    /out:$resolvedOutputPath `
+    /reference:System.Windows.Forms.dll `
+    /reference:System.Drawing.dll `
+    $sourcePath
+
+if ($LASTEXITCODE -ne 0) {
+    throw "csc.exe failed with exit code $LASTEXITCODE."
+}
+
+Write-Host "Created EXE:"
+Write-Host "  $resolvedOutputPath"