feat(01-01): create device registry, show store, FastAPI app, API routes, and frontend shell

- DeviceRegistry with load/save/add/remove/instantiate and _DEVICE_CLASSES dict
- ShowStore with save/load/list_ids using aiofiles for async I/O
- FastAPI app with lifespan hook (startup: load registry/store, shutdown: save registry)
- API routes: GET/POST /api/devices/, DELETE /api/devices/{id}, GET/POST /api/shows/, GET /api/shows/{id}
- WebSocket stub at /ws with ConnectionManager and ack echo
- Frontend shell: DAW layout with header, sidebar (DEVICES + ANIMATIONS), TIMELINE, TRANSPORT
- Terminal aesthetic: dark theme, cyan accents, monospace fonts, no drop shadows
- .gitignore for runtime data (devices.json, shows/, __pycache__, .venv)

lightsync/__main__.py

@@ -0,0 +1,12 @@
+import os
+import uvicorn
+from dotenv import load_dotenv
+
+if __name__ == "__main__":
+    load_dotenv()
+    uvicorn.run(
+        "lightsync.main:app",
+        host=os.getenv("HOST", "0.0.0.0"),
+        port=int(os.getenv("PORT", "8000")),
+        reload=False,  # set True manually during dev only
+    )