feat(api): use Tencent 16k_zh_large ASR and remove local Whisper

Standardize ASR on Tencent's dialect-capable engine across all environments,
drop faster-whisper from dependencies and deployment images, and add an
expo-sqlite iOS vendor sync plus pod install in prebuild to prevent native
build failures after npm install.

Co-authored-by: Cursor <cursoragent@cursor.com>

app-expo/tests/features/voice/recorder.test.ts

@@ -18,7 +18,7 @@ import {
 } from '@/features/voice/recorder';
 
 describe('buildVoiceRecordingOptions', () => {
-  test('uses 16 kHz mono m4a recording options for Tencent-compatible speech capture', () => {
+  test('uses 16 kHz mono m4a recording options for Tencent 16k_zh_large capture', () => {
     const passedOptions = buildVoiceRecordingOptions();
 
     expect(passedOptions).toEqual(