geenforce client: make ApiToken optional for IP-allowlisted kiosks

Get-ShopdbConfig required both BaseUrl AND ApiToken, so a token-less kiosk
(authorized by the server's IP allowlist) got a null config and never ran.
Now BaseUrl alone is a valid config; X-API-Key is sent only when a token is
present (New-ShopdbAuthHeaders), so token-authorized sites are unchanged and
vaulted-network sites need no per-PC token.

plugins/geenforce/client/Invoke-ShopdbEnforce.ps1

@@ -85,7 +85,7 @@ try {
 
     $config = Get-ShopdbConfig -BaseUrl $BaseUrl -ApiToken $ApiToken
     if (-not $config) {
-        Write-Log 'No shopdb BaseUrl/ApiToken configured yet - retry next cycle.' 'WARN'
+        Write-Log 'No shopdb BaseUrl configured yet - retry next cycle.' 'WARN'
         exit 0
     }
 

plugins/geenforce/client/ShopdbEnforceClient.psm1

@@ -66,10 +66,22 @@ function Get-ShopdbConfig {
         if (-not $BaseUrl -and $props.BaseUrl) { $BaseUrl = $props.BaseUrl }
         if (-not $ApiToken -and $props.ApiToken) { $ApiToken = $props.ApiToken }
     }
-    if (-not $BaseUrl -or -not $ApiToken) { return $null }
+    # ApiToken is OPTIONAL: on a vaulted network the server may authorize by
+    # source-IP allowlist, so a BaseUrl alone is a valid config. When a token
+    # is present it is still sent (and honored) for token-authorized sites.
+    if (-not $BaseUrl) { return $null }
     return @{ BaseUrl = $BaseUrl.TrimEnd('/'); ApiToken = $ApiToken }
 }
 
+
+function New-ShopdbAuthHeaders {
+    # Only send X-API-Key when a token is configured; a token-less client
+    # relies on the server's IP allowlist.
+    param($Config)
+    if ($Config.ApiToken) { return @{ 'X-API-Key' = $Config.ApiToken } }
+    return @{}
+}
+
 function Sync-ShopdbManifest {
     <#
       Fetch the current published manifest for a scope into a local cache, using
@@ -87,7 +99,7 @@ function Sync-ShopdbManifest {
     if (-not (Test-Path $CacheDir)) { New-Item -ItemType Directory -Path $CacheDir -Force | Out-Null }
     $manifestPath = Join-Path $CacheDir "$Scope.json"
     $etagPath     = Join-Path $CacheDir "$Scope.etag"
-    $headers = @{ 'X-API-Key' = $Config.ApiToken }
+    $headers = New-ShopdbAuthHeaders $Config
     if (Test-Path $etagPath) { $headers['If-None-Match'] = (Get-Content -LiteralPath $etagPath -Raw).Trim() }
 
     $uri = "$($Config.BaseUrl)/api/geenforce/manifest?pctype=$([uri]::EscapeDataString($Scope))"
@@ -170,7 +182,7 @@ function Send-ShopdbReport {
     try {
         $body = ($Report | ConvertTo-Json -Depth 6)
         Invoke-RestMethod -Uri "$($Config.BaseUrl)/api/geenforce/report" `
-            -Method Post -Headers @{ 'X-API-Key' = $Config.ApiToken } `
+            -Method Post -Headers (New-ShopdbAuthHeaders $Config) `
             -ContentType 'application/json' -Body $body -TimeoutSec 30 -ErrorAction Stop | Out-Null
         return $true
     } catch {
@@ -250,7 +262,7 @@ function Get-ShopdbPayload {
     $uri = "$($Config.BaseUrl)/api/geenforce/payload/$sha"
     $tmp = "$dest.tmp"
     try {
-        Invoke-WebRequest -Uri $uri -Headers @{ 'X-API-Key' = $Config.ApiToken } `
+        Invoke-WebRequest -Uri $uri -Headers (New-ShopdbAuthHeaders $Config) `
             -UseBasicParsing -TimeoutSec 120 -OutFile $tmp -ErrorAction Stop
     } catch {
         if (Test-Path $tmp) { Remove-Item -LiteralPath $tmp -Force -ErrorAction SilentlyContinue }