speaker: force-add audio-route plugin dist stubs (global dist/ ignore would drop them from a fresh clone)

mobile/plugins/audio-route/dist/esm/index.d.ts

@@ -0,0 +1 @@
+export {};

mobile/plugins/audio-route/dist/esm/index.js

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+// Native-only plugin — the web app calls window.Capacitor.Plugins.AudioRoute directly (it loads the UI from
+// a remote URL, so nothing here is bundled). This stub only exists so the npm package resolves.
+export {};

mobile/plugins/audio-route/dist/plugin.cjs.js

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+'use strict';
+// Native-only plugin stub (see dist/esm/index.js).