Start the Windows service right after install (parity with enable --now)

internal/service/service_windows.go

@@ -172,6 +172,10 @@ func Install(configPath string, copyBin bool) error {
 		s.Delete() // roll back so a retry starts clean
 		return err
 	}
+	// Best effort: start now instead of waiting for the next boot. A
+	// missing config (no consumer URLs) fails the start; the service stays
+	// registered and can be started once the config exists.
+	s.Start()
 	return nil
 }