Service: menu before Options + start-after-audio dependency

Local checkpoint - NOT for public release.

- Service menu now sits before Options in the menu bar (File / Record / Service /
  Options / Help), per Ed.
- The service is registered with depend= Audiosrv/AudioEndpointBuilder, so Windows
  starts it the instant the audio services are ready at boot (before login) - the
  earliest point WASAPI capture can find any audio. It CANNOT start before the audio
  services (there'd be no endpoints to capture, and no sound exists before audio is up),
  so this is the earliest useful start. DoInstall now uses the single BuildCreateArgs
  source of truth.

Gate 25/25.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/RemSound.App/MainForm.cs

@@ -2170,8 +2170,8 @@ public sealed class MainForm : Form
         // and the arrow keys.
         menu.Items.Add(fileMenu);
         menu.Items.Add(recordMenu);
-        menu.Items.Add(optionsMenu);
         menu.Items.Add(BuildServiceMenu());
+        menu.Items.Add(optionsMenu);
         menu.Items.Add(helpMenu);
         return menu;
     }