Found and fixed 6 additional instances of hardcoded nodeID=1 in:
- HandleMetadataV1 (2 instances in partition metadata)
- HandleMetadataV3V4 (4 instances in partition metadata)
All Metadata response versions (v0-v8) now correctly use the broker's actual
nodeID for LeaderID, ReplicaNodes, and IsrNodes instead of hardcoded 1.
This ensures consistent metadata across all API versions.