stela ops usage fixes roles propagation and timoeut, one account to support multi tenants, migrations consolidation, search to support documentation, doctor and open api vector db search

devops/compose/postgres-init/advisoryai-knowledge-test/01_extensions.sql

@@ -0,0 +1,10 @@
+CREATE SCHEMA IF NOT EXISTS advisoryai;
+
+DO $$
+BEGIN
+    CREATE EXTENSION IF NOT EXISTS vector;
+EXCEPTION
+    WHEN OTHERS THEN
+        RAISE NOTICE 'pgvector extension unavailable in test DB image; AKS falls back to array embeddings.';
+END
+$$;