feat(gns3_copilot): enhance topology logging with structured details

Improve logging in GNS3 topology reader to provide more structured and informative output. The previous single-line JSON log has been replaced with separate info and debug logs:
- Info log now includes project ID, project name, node count, and link count
- Debug log retains the full topology details for deeper inspection
This makes it easier to monitor topology retrieval in production while keeping detailed data available for debugging.

gns3server/agent/gns3_copilot/gns3_client/gns3_topology_reader.py

@@ -90,7 +90,12 @@ class GNS3TopologyTool(BaseTool):
             }
 
             # Log topology result
-            logger.info("Topology retrieved: %s", topology)
+            logger.info("Topology retrieved: project_id=%s, name=%s, nodes=%d, links=%d",
+                        topology.get("project_id"),
+                        topology.get("name"),
+                        len(topology.get("nodes", {})),
+                        len(topology.get("links", [])))
+            logger.debug("Topology details: %s", topology)
 
             return topology