Add API get network link nodes

tjnetwork.py

@@ -839,6 +839,16 @@ def get_network_coords(name: str) -> dict[str, dict[str, float]]:
         result[node_id] = api.get_node_coord(name, node_id)
     return result
 
+# DingZQ, 2024-12-08, get all links' start and end node
+# link_id:node_id1:node_id2
+def get_network_link_nodes(name: str) -> list[str]:
+    links = api.get_links(name)
+    result = []
+    for link_id in links:
+        nodes = api.get_link_nodes(name, link_id)
+        result.append(f"{link_id}:{nodes[0]}:{nodes[1]}")
+    return result
+
 ############################################################
 # vertex 25.[VERTICES]
 ############################################################