feat: add /api/home_assistant route

apps/dashboard/backend/app/routes/home_assistant.py

@@ -0,0 +1,16 @@
+from __future__ import annotations
+
+from fastapi import APIRouter, Depends
+
+from app.models.sources import HomeAssistantSnapshot
+from app.services.aggregator import AggregatorService, get_aggregator_service
+
+
+router = APIRouter(prefix="/api", tags=["home_assistant"])
+
+
+@router.get("/home_assistant", response_model=HomeAssistantSnapshot)
+async def get_home_assistant(
+    aggregator: AggregatorService = Depends(get_aggregator_service),
+) -> HomeAssistantSnapshot:
+    return await aggregator.get_home_assistant()