forgot password in login page and account info implemented, sms.ir service works fine with sandbox key.

backend/src/common/utils/mobile.util.ts

@@ -0,0 +1,20 @@
+const IRAN_MOBILE_PATTERN = /^9\d{9}$/;
+
+/** Normalize Iranian mobile to sms.ir format (e.g. 9123456789). */
+export function normalizeIranMobile(input: string): string {
+  let digits = input.replace(/\D/g, '');
+
+  if (digits.startsWith('98') && digits.length === 12) {
+    digits = digits.slice(2);
+  }
+
+  if (digits.startsWith('0') && digits.length === 11) {
+    digits = digits.slice(1);
+  }
+
+  return digits;
+}
+
+export function isValidIranMobile(input: string): boolean {
+  return IRAN_MOBILE_PATTERN.test(normalizeIranMobile(input));
+}