Add method to get nodes in extent

main.py

@@ -1424,6 +1424,12 @@ async def fastapi_get_major_node_coords(network: str, diameter: int) -> list[str
         result.append(f"{node_id}:{coord['type']}:{coord['x']}:{coord['y']}")
     return result
 
+# DingZQ, 2025-01-03, get network in extent
+@app.get("/getnetworkinextent/")
+async def fastapi_get_network_in_extent(network: str, x1: float, y1: float, x2: float, y2: float) -> dict[str, Any] | None:
+    # TODO
+    pass    
+
 # DingZQ, 2024-12-08, get all links' start and end node 
 # link_id:link_type:node_id1:node_id2
 @app.get("/getnetworklinknodes/")