feat: add automated setup scripts for Windows and Linux and update Windows entry point

scripts/setup.ps1

@@ -13,7 +13,6 @@ $distDir     = Join-Path $appDir   "dist"
 
 # ── Helpers ───────────────────────────────────────────────────────────────────
 function Print-Header {
-    Clear-Host
     Write-Host ""
     Write-Host "  ============================================================" -ForegroundColor Cyan
     Write-Host "   LOCAL AI IMAGE GENERATOR  -  First-Time Setup" -ForegroundColor Cyan

scripts/setup.sh

@@ -55,7 +55,6 @@ fi
 
 # ── Helpers ─────────────────────────────────────────────────────────────────
 print_header() {
-  clear 2>/dev/null || true
   echo ""
   echo "  ============================================================"
   echo "   LOCAL AI IMAGE GENERATOR  -  $PLATFORM_LABEL First-Time Setup"