feat: add gated housekeeping foundation preview

src/features/housekeeping/foundation/preview-gate.ts

@@ -0,0 +1,6 @@
+export function isHousekeepingPreviewEnabled(input: {
+	nodeEnv: "development" | "test" | "production";
+	flag: boolean;
+}): boolean {
+	return input.nodeEnv !== "production" && input.flag;
+}