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/store/show_store.py

@@ -0,0 +1,29 @@
+import aiofiles
+from pathlib import Path
+from lightsync.models.show import ShowModel
+
+
+class ShowStore:
+    def __init__(self, shows_dir: Path):
+        self._dir = shows_dir
+
+    def ensure_dir(self) -> None:
+        self._dir.mkdir(parents=True, exist_ok=True)
+
+    def _path_for(self, show_id: str) -> Path:
+        return self._dir / f"{show_id}.json"
+
+    async def save(self, show: ShowModel) -> None:
+        path = self._path_for(str(show.id))
+        async with aiofiles.open(path, "w") as f:
+            await f.write(show.model_dump_json(indent=2))
+
+    async def load(self, show_id: str) -> ShowModel | None:
+        path = self._path_for(show_id)
+        if not path.exists():
+            return None
+        async with aiofiles.open(path) as f:
+            return ShowModel.model_validate_json(await f.read())
+
+    def list_ids(self) -> list[str]:
+        return [p.stem for p in self._dir.glob("*.json")]