feat(telemetry): add meta endpoints information to telemetry data (#18591)

- Add 'endpoints' field to meta_config section in telemetry payload
- Provides visibility into configured meta service endpoints for operational monitoring
- Follows existing telemetry structure without breaking changes

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-authored-by: Claude <[email protected]>

Author: BohuTANG

src/query/service/src/clusters/cluster.rs

@@ -810,6 +810,7 @@ impl ClusterDiscovery {
                 "meta_embedded": cfg.meta.embedded_dir.is_empty(),
                 "meta_client_timeout": cfg.meta.client_timeout_in_second,
                 "rpc_client_timeout_secs": cfg.query.rpc_client_timeout_secs,
+                "endpoints": cfg.meta.endpoints,
             },
             "license": license_info,
             "cluster_nodes": {