feat(admin): normalize Persian/Arabic digits in every numeric field

Users typing on a Persian keyboard produced two distinct failures. Fields with
type="number" silently returned an empty string — the browser rejects Persian
digits, so the value was lost and saved as empty or zero. Text fields passed the
Persian characters straight through to the database, where a mobile stored as
۰۹۱۲… never matches 09… again. The secretary form hit the second case with no
validation at all.

Frontend:
- Adds digitsOnly() and the national-code schemas to lib/utils, plus lib/forms
  with numericField()/latinDigitsField() wrappers for React Hook Form fields.
- Converts every type="number" input to type="text" inputMode="numeric" with
  digit normalization; none remain. Fields that legitimately carry non-digits
  (sheba, landline) only get the digits translated, keeping IR and separators.
- Points the patient national-code and mobile schemas at the shared normalizing
  schemas, which accept Persian input instead of rejecting it.
- Drops two duplicate local digit converters in favour of the shared helper.

Backend:
- Adds NumericFieldNormalizerSubscriber, translating digits in whitelisted
  numeric keys of JSON request bodies under /api/v1/ before controllers run, so
  nobat724_front and clinic-pro-tauri are covered too. Translation only — no
  characters are stripped, non-string values and other keys are untouched.

Three component tests asserted on role="spinbutton" and numeric input values;
both are properties of type="number", so they were updated to match the new
text inputs.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

assets/admin/lib/utils.test.ts

@@ -1,5 +1,10 @@
 import { describe, it, expect } from 'vitest';
+import { z } from 'zod';
 import {
+    digitsOnly,
+    persianSafeNumber,
+    iranNationalCodeSchema,
+    iranNationalCodeOptionalSchema,
     formatRial,
     rialToToman,
     tomanToRial,
@@ -130,6 +135,45 @@ describe('toEnglishDigits', () => {
     });
 });
 
+describe('digitsOnly', () => {
+    it('رقم فارسی و عربی مخلوط را نرمال و غیررقم را حذف می‌کند', () => {
+        expect(digitsOnly('۱۲٣٤-56 ب')).toBe('123456');
+    });
+    it('با maxLen برش می‌زند', () => {
+        expect(digitsOnly('۱۲۳۴۵۶۷۸۹۰۱۲', 10)).toBe('1234567890');
+    });
+    it('ورودی خالی → رشته خالی', () => {
+        expect(digitsOnly('')).toBe('');
+    });
+    it('فقط حروف → خالی', () => {
+        expect(digitsOnly('کد ملی')).toBe('');
+    });
+});
+
+describe('persianSafeNumber', () => {
+    it('رشته‌ی فارسی را قبل از عدد شدن نرمال می‌کند', () => {
+        const schema = persianSafeNumber(z.coerce.number());
+        expect(schema.parse('۱۲۳')).toBe(123);
+    });
+    it('عدد را دست‌نخورده رد می‌کند', () => {
+        const schema = persianSafeNumber(z.coerce.number());
+        expect(schema.parse(42)).toBe(42);
+    });
+});
+
+describe('iranNationalCodeSchema', () => {
+    it('کد ملی فارسی را می‌پذیرد و لاتین برمی‌گرداند', () => {
+        expect(iranNationalCodeSchema.parse('۰۰۱۲۳۴۵۶۷۸')).toBe('0012345678');
+    });
+    it('کمتر از ۱۰ رقم رد می‌شود', () => {
+        expect(() => iranNationalCodeSchema.parse('12345')).toThrow();
+    });
+    it('نسخه‌ی اختیاری خالی را می‌پذیرد', () => {
+        expect(iranNationalCodeOptionalSchema.parse('')).toBe('');
+        expect(() => iranNationalCodeOptionalSchema.parse('123')).toThrow();
+    });
+});
+
 describe('sanitizeMobileInput', () => {
     it('غیررقم حذف، رقم فارسی نرمال، حداکثر ۱۱ رقم', () => {
         expect(sanitizeMobileInput('۰۹۱۲-۳۴۵ ۶۷۸۹۰۱۲')).toBe('09123456789');