feat(apps): catalog.json + chromium configure + winget bootstrap + build staging

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

windows/installer/build.ps1

@@ -172,6 +172,17 @@ function Copy-WelcomePayload {
     } else {
         Write-Warning "   No *.json flavour files found in $flavoursDir -- image will ship with no flavours."
     }
+    # Stage the app catalog + configure/bootstrap scripts next to the Welcome app
+    # (mirrors the flavours copy above): catalog.json, configure\*.ps1, bootstrap-winget.ps1.
+    $appsDest = Join-Path $dest 'apps'
+    $null = New-Item -ItemType Directory -Force $appsDest
+    $appsDir = Join-Path $WindowsDir 'apps'
+    if (Test-Path $appsDir) {
+        Copy-Item (Join-Path $appsDir '*') $appsDest -Recurse -Force
+        Write-Host "   Copied app catalog + scripts to $appsDest"
+    } else {
+        Write-Warning "   No apps dir found at $appsDir -- image will ship with no app catalog."
+    }
     # --- Guard: verify the payload actually landed in the mounted image -------
     $stagedExe = Join-Path $dest 'SilverOS.Welcome.App.exe'
     if (-not (Test-Path $stagedExe)) {
@@ -181,6 +192,10 @@ function Copy-WelcomePayload {
     if (-not $stagedFlavours) {
         throw "Welcome bake failed: no flavour manifests staged in '$destFlavours'. Add *.json files under windows/flavours/ or the installed wizard will have no flavour choices."
     }
+    $stagedCatalog = Join-Path $appsDest 'catalog.json'
+    if (-not (Test-Path $stagedCatalog)) {
+        throw "Welcome bake failed: app catalog.json missing from image (expected at '$stagedCatalog'). Add windows/apps/catalog.json or the wizard's Apps step will be empty."
+    }
     Write-Host "   Welcome payload staged at $dest"
 }