Fix mobile validation, cascade delete for businesses/categories, and DB error handling.

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

src/common/utils/iran-mobile.util.ts

@@ -0,0 +1,39 @@
+const PERSIAN_DIGITS = '۰۱۲۳۴۵۶۷۸۹';
+const ARABIC_DIGITS = '٠١٢٣٤٥٦٧٨٩';
+const INVISIBLE_CHARS = /[\u200c\u200d\u202a-\u202e\ufeff]/g;
+
+export const IRAN_MOBILE_REGEX = /^09\d{9}$/;
+
+function toAsciiDigits(value: string): string {
+  return value.replace(/[۰-۹٠-٩]/g, (ch) => {
+    const persian = PERSIAN_DIGITS.indexOf(ch);
+    if (persian >= 0) return String(persian);
+    const arabic = ARABIC_DIGITS.indexOf(ch);
+    if (arabic >= 0) return String(arabic);
+    return ch;
+  });
+}
+
+/** Normalize Iranian mobile to 09xxxxxxxxx (11 digits). */
+export function normalizeIranMobile(raw: string): string {
+  let mobile = toAsciiDigits(String(raw ?? '').trim());
+  mobile = mobile.replace(INVISIBLE_CHARS, '');
+
+  let digits = mobile.replace(/\D/g, '');
+  if (!digits) return '';
+
+  if (digits.startsWith('0098')) {
+    digits = digits.slice(2);
+  }
+  if (digits.startsWith('98') && digits.length >= 12) {
+    digits = `0${digits.slice(2)}`;
+  } else if (digits.startsWith('9') && digits.length === 10) {
+    digits = `0${digits}`;
+  }
+
+  return digits;
+}
+
+export function isValidIranMobile(mobile: string): boolean {
+  return IRAN_MOBILE_REGEX.test(mobile);
+}