feat(mcp): подготовить сервер и доступ к приёмке

backend/drizzle/0036_diagnostic_cancellations.sql

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+-- Durable stop requests for opt-in diagnostics, not configuration rollback.
+BEGIN;
+CREATE TABLE mcp_diagnostic_cancellations (
+  operation_id uuid PRIMARY KEY REFERENCES mcp_operations(id),
+  connection_id uuid NOT NULL REFERENCES mcp_connections(id),
+  actor_id text NOT NULL CHECK (length(actor_id) BETWEEN 1 AND 200),
+  created_at timestamptz NOT NULL DEFAULT clock_timestamp()
+);
+CREATE FUNCTION mcp_diagnostic_cancellation_immutable() RETURNS trigger LANGUAGE plpgsql AS $$
+BEGIN RAISE EXCEPTION 'diagnostic cancellation request is immutable'; END $$;
+CREATE TRIGGER mcp_diagnostic_cancellation_immutable BEFORE UPDATE OR DELETE ON mcp_diagnostic_cancellations
+  FOR EACH ROW EXECUTE FUNCTION mcp_diagnostic_cancellation_immutable();
+INSERT INTO schema_migrations(id) VALUES ('0036_diagnostic_cancellations') ON CONFLICT (id) DO NOTHING;
+COMMIT;