diag(ios audio): setSpeaker returns actual output port + category/mode + native marker

Telemetry only showed 'override didn't throw', and the web __BUILD tag can't tell
native binaries apart, so we couldn't see WHERE iOS actually routed the audio or
which plugin build ran. setSpeaker now resolves with the real currentRoute output
port (Receiver/Speaker/Bluetooth), the live AVAudioSession category/mode/options,
and a native-build marker (1.0.2-diag) so the route log is unambiguous.

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

mobile/plugins/audio-route/package.json

@@ -1,6 +1,6 @@
 {
   "name": "audio-route",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "iOS earpiece/speaker audio route toggle for Biz Connect",
   "main": "dist/plugin.cjs.js",
   "module": "dist/esm/index.js",