feat(cloud-api): add workspace application entrypoint

apps/cloud-api/cloud_api/app.py

@@ -0,0 +1,8 @@
+from __future__ import annotations
+
+from fastapi import FastAPI
+
+
+def create_app() -> FastAPI:
+    """Create the independently deployable cloud API application."""
+    return FastAPI(title="Device Cloud API")