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/tests/conftest.py

@@ -0,0 +1,9 @@
+"""Shared test configuration."""
+
+from __future__ import annotations
+
+import sys
+import os
+
+# Ensure the server package is importable
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))