Initial commit: Media server and Home Assistant integration

- FastAPI server for Windows media control via WinRT/SMTC
- Home Assistant custom integration with media player entity
- Script button entities for system commands
- Position tracking with grace period for track skip handling
- Server availability detection in HA entity

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

media_server/routes/__init__.py

@@ -0,0 +1,7 @@
+"""API route modules."""
+
+from .health import router as health_router
+from .media import router as media_router
+from .scripts import router as scripts_router
+
+__all__ = ["health_router", "media_router", "scripts_router"]