feat(mcp): подготовить сервер и доступ к приёмке

backend/drizzle/0033_flow_settings_intents.sql

@@ -0,0 +1,11 @@
+-- A claim survives unknown results and is never recycled for another attempt.
+CREATE TABLE IF NOT EXISTS flow_settings_intents (
+  receipt_id uuid NOT NULL,
+  phase text NOT NULL CHECK (phase IN ('configuration', 'listener')),
+  request_proof text NOT NULL,
+  state text NOT NULL DEFAULT 'claimed' CHECK (state IN ('claimed', 'completed')),
+  result jsonb,
+  created_at timestamptz NOT NULL DEFAULT now(),
+  PRIMARY KEY (receipt_id, phase)
+);
+INSERT INTO traffic_flow_settings(id) VALUES(1) ON CONFLICT DO NOTHING;