When querying a large repository graph (e.g., 479,139 nodes and 1,073,177 edges), the /api/graph endpoint…

When querying a large repository graph (e.g., 479,139 nodes and 1,073,177 edges), the /api/graph endpoint…: a task in LegoFlow-SWE (Harbor dataset). To fix this, the endpoint must support streaming large responses so that the full graph is never held in memory as a single string.