feat: RSL starten in Dev mode 15 Sek. und in prod. 120 Sek.

utils/env.ts

@@ -0,0 +1,17 @@
+// Centralized, typed access to public environment variables
+// NEXT_PUBLIC_* variables are exposed to the browser by Next.js at build time.
+
+export const NODE_ENV = process.env.NODE_ENV;
+
+const toNumber = (val: string | undefined): number | undefined => {
+  if (val === undefined) return undefined;
+  const n = Number(val);
+  return Number.isFinite(n) ? n : undefined;
+};
+
+// RSL measurement duration in seconds. Default: 15s in dev, 120s otherwise.
+export const RSL_DURATION_SECONDS: number = (() => {
+  const fromEnv = toNumber(process.env.NEXT_PUBLIC_RSL_DURATION_SECONDS);
+  if (fromEnv !== undefined) return fromEnv;
+  return NODE_ENV === "development" ? 15 : 120;
+})();