Add digital catalog with shareable flipbook and ktg.montzar.ir deploy files.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/rate-limit.ts

@@ -0,0 +1,25 @@
+export type RateLimiter = {
+  check: (ip: string) => boolean;
+};
+
+export function createRateLimiter(
+  limit: number,
+  windowMs: number,
+  now: () => number = () => Date.now(),
+): RateLimiter {
+  const hits = new Map<string, number[]>();
+
+  return {
+    check(ip: string) {
+      const t = now();
+      const recent = (hits.get(ip) ?? []).filter((ts) => t - ts < windowMs);
+      if (recent.length >= limit) {
+        hits.set(ip, recent);
+        return false;
+      }
+      recent.push(t);
+      hits.set(ip, recent);
+      return true;
+    },
+  };
+}