add app control server for launcher-to-app attachment

- Launcher detects a running app via control socket and attaches without spawning a new process
- Own-lifecycle app launches now pass --background --managed-playback; borrowed apps skip --background
- Separate plain subtitle websocket (tokens: []) from annotation websocket
- Default pauseVideoOnHover to true; update docs and config.example.jsonc
- Setup: remove plugin readiness card, add Open SubMiner Settings button

src/main/runtime/tray-runtime-handlers.test.ts

@@ -31,7 +31,6 @@ test('tray runtime handlers compose resolve/menu/ensure/destroy handlers', () =>
       openFirstRunSetupWindow: () => {},
       showWindowsMpvLauncherSetup: () => true,
       openYomitanSettings: () => {},
-      openRuntimeOptionsPalette: () => {},
       openConfigSettingsWindow: () => {},
       openJellyfinSetupWindow: () => {},
       isJellyfinConfigured: () => false,