feature/accuracy-grounded-retrieval-62
master
Aligns with server-infra#10 / PR #11 — SearxNG binds 8088 on ai-server-4080.
Phases 1–3: split THINKING/FAST/UTILITY/EMBED models, structured search with SearxNG primary + DDGS failover, fail-open grounding, citations on Prompt + WS frames, single history window with prompt budgeting, and reindex_embeddings.