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/api/devices.py

@@ -0,0 +1,24 @@
+from fastapi import APIRouter, HTTPException
+from lightsync.models.device import DeviceConfig
+import lightsync.main as state  # access registry via module-level ref
+
+router = APIRouter(tags=["devices"])
+
+
+@router.get("/")
+async def list_devices() -> list[DeviceConfig]:
+    return state.registry.list_all()
+
+
+@router.post("/", status_code=201)
+async def add_device(config: DeviceConfig) -> DeviceConfig:
+    state.registry.add(config)
+    await state.registry.save()
+    return config
+
+
+@router.delete("/{device_id}", status_code=204)
+async def remove_device(device_id: str):
+    if not state.registry.remove(device_id):
+        raise HTTPException(404, "Device not found")
+    await state.registry.save()