fix(installer): send correct Host header in Traefik routing check

The root redirect rule matches Host(`PUBLIC_HOST`), not localhost.
Curl with --resolve (bash) and Host header (PS1) so the health
check sends the right hostname when verifying Traefik routing.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

installer/install.ps1

@@ -924,9 +924,11 @@ function Wait-DockerHealthy {
 }
  
 function Test-Endpoint {
-    param([string]$Name, [string]$Url, [int]$TimeoutSecs = 120)
+    param([string]$Name, [string]$Url, [int]$TimeoutSecs = 120, [string]$HostHeader = '')
     $start = Get-Date
     $lastDot = -1
+    $headers = @{}
+    if ($HostHeader) { $headers['Host'] = $HostHeader }
     while ($true) {
         $elapsed = [int]((Get-Date) - $start).TotalSeconds
         if ($elapsed -ge $TimeoutSecs) {
@@ -935,7 +937,7 @@ function Test-Endpoint {
         }
         try {
             # -SkipCertificateCheck is PS6+ only; SSL trust is handled by Enable-TrustAllCerts above
-            $resp = Invoke-WebRequest -Uri $Url -UseBasicParsing -TimeoutSec 5 -ErrorAction Stop
+            $resp = Invoke-WebRequest -Uri $Url -UseBasicParsing -TimeoutSec 5 -Headers $headers -ErrorAction Stop
             $dur = [int]((Get-Date) - $start).TotalSeconds
             Write-Host ("  [ok]   {0,-20} ready ({1}s)" -f $Name, $dur) -ForegroundColor Green
             return $true
@@ -976,7 +978,7 @@ function Verify-Health {
             if (-not (Test-Endpoint 'Cameleer SaaS' "https://localhost:$($c.HttpsPort)/platform/api/config" 120)) { $failed = $true }
         }
         if (-not $failed) {
-            if (-not (Test-Endpoint 'Traefik routing' "https://localhost:$($c.HttpsPort)/" 30)) { $failed = $true }
+            if (-not (Test-Endpoint 'Traefik routing' "https://localhost:$($c.HttpsPort)/" 30 $c.PublicHost)) { $failed = $true }
         }
     }