feat: initial project scaffold — server, client, Android APK

- FastAPI server with audio mixer (Windows + Voicemeeter), media tracking,
  notifications (progress + alerts), telemetry, and system tray .exe build
- Test suite covering notifications, audio mixer, media, telemetry, and API
- E-Ink web client (vanilla JS, DOM API, block meters, swipe gestures)
- Android WebView APK for BOOX Go 7 Color Gen II (Android 13, Kotlin)
- Design decision records in .pi/docs/design/
- PyInstaller build script for server .exe

server/requirements.txt

@@ -0,0 +1,17 @@
+# Core
+fastapi>=0.100.0
+uvicorn[standard]>=0.23.0
+pydantic>=2.0.0
+
+# Windows APIs
+winsdk>=1.0.0
+pycaw>=20230407
+voicemeeter-api>=1.0.0
+
+# Hardware telemetry
+pyhwinfo>=0.1.0
+
+# Build & packaging
+pyinstaller>=6.0.0
+pystray>=0.19.0
+Pillow>=10.0.0