fix(update): restart service if stopped even when no git updates

Previously update.ps1 exited immediately when no updates were available,
leaving the service stopped if a prior restart had failed.

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

update.ps1

@@ -45,7 +45,17 @@ $local = git rev-parse HEAD
 $remote = git rev-parse FETCH_HEAD
 
 if ($local -eq $remote) {
+    # Verify service is running even when no updates
+    $status = (nssm status GoMagVending 2>&1) -replace '\0',''
+    if ($status -ne 'SERVICE_RUNNING') {
+        Log "Nicio actualizare, dar serviciul nu ruleaza ($status). Restart..." "Yellow"
+        nssm restart GoMagVending 2>&1 | Out-Null
+        Start-Sleep -Seconds 3
+        $status = (nssm status GoMagVending 2>&1) -replace '\0',''
+        Log "Serviciu: $status" "Green"
+    } else {
         Log "Nicio actualizare disponibila." "Gray"
+    }
     exit 0
 }