feat(coins): add sample-query endpoint and resolve Freebase MIDs to names

feat(coins): add optional seed param and label fields to sample-triples

feat(kg-anomaly): add correct/continue endpoints with SSE streaming

docs(postman): add thesis-optimal multiprox params and force-unlock endpoint

Implement COINs predict endpoint

Implement backend discovery endpoints

Implement API skeleton

Add postman collection and environment for API