Add X-ASR experimental backend

Ariver

2026-06-07 d435cd4b9754de4a567261b1a877add3af977d9a

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run_id=20260603.005122
backup_dir=/Users/ar/Projects/VoiceSnap-2.1.1-QA-build/QA-backups/pre-new-user-recognition-20260603.005122
hold_dir=/Users/ar/Projects/VoiceSnap-2.1.1-QA-build/QA-backups/original-userdata-held-for-new-user-recognition-20260603.005122
app_data_exists_after_move=no
held_size=235M    /Users/ar/Projects/VoiceSnap-2.1.1-QA-build/QA-backups/original-userdata-held-for-new-user-recognition-20260603.005122/PrivateVoice Input