chore: shift all ports by +40000 to avoid defaults

8080->48080, 8889->48889, 8888->48888, 9997->49997, 8189->48189

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/install.ps1

@@ -19,8 +19,8 @@
 
 [CmdletBinding()]
 param(
-    [string]$FirewallRuleName = "GameStream-UDP-8189",
-    [int]$UdpPort = 8189
+    [string]$FirewallRuleName = "GameStream-UDP-48189",
+    [int]$UdpPort = 48189
 )
 
 $ErrorActionPreference = 'Stop'
@@ -110,6 +110,6 @@ Write-Host "       Frontend dir    : $(Join-Path $projectRoot 'frontend')"
 Write-Host "  3. Configure OBS Stream output:"
 Write-Host "       Service  : Custom"
 Write-Host "       Protocol : WHIP"
-Write-Host "       Server   : http://localhost:8889/game/whip"
+Write-Host "       Server   : http://localhost:48889/game/whip"
 Write-Host "  4. See docs/ for NPM + Authentik setup on your reverse proxy host."
 Write-Host ""