feat: slugify, rate limit ed env helper con test

src/lib/rate-limit.ts

@@ -0,0 +1,17 @@
+const buckets = new Map<string, number[]>();
+
+export function rateLimit(key: string, max: number, windowMs: number): boolean {
+  const now = Date.now();
+  const recent = (buckets.get(key) ?? []).filter((t) => now - t < windowMs);
+  if (recent.length >= max) {
+    buckets.set(key, recent);
+    return false;
+  }
+  recent.push(now);
+  buckets.set(key, recent);
+  return true;
+}
+
+export function _resetBuckets(): void {
+  buckets.clear();
+}