Generacion de estructura ddd para backend

feat: Refactor API structure by consolidating endpoints and removing deprecated files

backend/domains/experiments/ping_endpoint_v1.py

@@ -0,0 +1,9 @@
+# backend/api/endpoints/ping.py
+
+from fastapi import APIRouter
+
+router = APIRouter()
+
+@router.get("/")
+async def ping():
+    return {"message": "pong"}