chore: init monorepo snapshot

wolai-backend/app/routers/health.py

@@ -0,0 +1,11 @@
+from typing import Dict
+
+from fastapi import APIRouter
+
+router = APIRouter()
+
+
+@router.get("/health")
+async def healthcheck() -> Dict[str, str]:
+    """简单健康检查，供阶段 0 自检使用。"""
+    return {"status": "ok"}