fix: correct entity_client batch resolve request format and response parsing

[realityinspector]

Summary

• Request format: Clockchain /figures/batch-resolve expects {"names": [{"display_name": "...", "entity_type": "..."}]} — was incorrectly sending {"names": ["name1", "name2"], "entity_type": "person"}
• Response parsing: Clockchain returns {"results": [{"figure": {"id": "...", "display_name": "..."}, "created": bool}]} — was incorrectly reading {"resolved": {"Name": "entity_id"}}
• Unit tests updated to match correct contract

Activation

Set ENTITY_RESOLUTION_ENABLED=true on Railway when ready to enable in production pipeline.