feat(multiproxan): stream graph-generation progress and refine comm20 render

feat(kganomaly): add streaming denoising backend with KG-likelihood metric

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

feat(graphgen): implement generate and continue endpoints with SSE streaming

Implement COINs predict endpoint

Implement backend discovery endpoints

Implement API skeleton