feat(voice-client): PySide6 desktop client and Windows build scripts

Add voice_confirmation_client (poll, TTS MP3 playback, mic WAV resolve),
PyInstaller spec, start/build helpers, and API unit tests.

Pending manual testing: end-to-end on OR workstations and packaged exe.

Made-with: Cursor

pyproject.toml

@@ -24,6 +24,7 @@ dependencies = [
 
 [project.scripts]
 operation-room-monitor-server = "main:main"
+voice-confirmation-client = "voice_confirmation_client.__main__:main"
 
 # Use PyTorch CPU wheels from the official index so:
 # - Linux Docker builds (incl. Docker Desktop on Mac) do not install NVIDIA CUDA pip bundles.
@@ -48,6 +49,19 @@ dev = [
     "aiosqlite>=0.21.0",
     "alembic>=1.14.0",
 ]
+voice-client = [
+    "httpx>=0.28.0",
+    "numpy>=2.0.0",
+    "PySide6>=6.8.0",
+    "sounddevice>=0.5.0",
+]
+voice-client-build = [
+    "httpx>=0.28.0",
+    "numpy>=2.0.0",
+    "PySide6>=6.8.0",
+    "sounddevice>=0.5.0",
+    "pyinstaller>=6.0.0",
+]
 
 [tool.pytest.ini_options]
 asyncio_mode = "auto"