Bundle sounddevice PortAudio library in sidecar builds

On macOS, sounddevice ships its own PortAudio dylib in the
_sounddevice_data directory. PyInstaller wasn't collecting it,
causing "Error querying device -1" when the sidecar tried to
open an audio stream.

Added data collection for _sounddevice_data in both cloud and
headless PyInstaller specs.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

local-transcription-headless.spec

@@ -38,6 +38,21 @@ datas = [
     (vad_assets_path, 'faster_whisper/assets'),
 ] + pvporcupine_data_files
 
+# Collect sounddevice's bundled PortAudio library (_sounddevice_data)
+try:
+    import sounddevice
+    sd_path = os.path.dirname(sounddevice.__file__)
+    sd_data = os.path.join(sd_path, '_sounddevice_data')
+    if os.path.exists(sd_data):
+        datas.append((sd_data, '_sounddevice_data'))
+        print(f"  + Collected sounddevice PortAudio data from {sd_data}")
+    sd_datas = collect_data_files('sounddevice')
+    if sd_datas:
+        datas += sd_datas
+        print(f"  + Collected {len(sd_datas)} sounddevice data files")
+except ImportError:
+    print("  - Warning: sounddevice not found")
+
 # Hidden imports -- NO PySide6/Qt needed for headless backend
 hiddenimports = [
     # Transcription engine
@@ -46,6 +61,7 @@ hiddenimports = [
     'faster_whisper.vad',
     'ctranslate2',
     'sounddevice',
+    '_sounddevice_data',
     'scipy',
     'scipy.signal',
     'numpy',