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/components/FreeVisitPrice.test.tsx

@@ -28,7 +28,7 @@ describe('FreeVisitPrice — الزامی کردن هزینه ویزیت', () =>
   it('toggle فعال + قیمت صفر → خطای inline و عدم ارسال درخواست', async () => {
     get.mockResolvedValue(pricing(0, false));
     renderWithProviders(<FreeVisitPrice />);
-    await waitFor(() => expect(screen.getByRole('spinbutton')).toHaveValue(0));
+    await waitFor(() => expect(screen.getByRole('textbox')).toHaveValue('0'));
 
     fireEvent.click(screen.getByRole('switch', { name: 'الزامی کردن هزینه ویزیت' }));
     fireEvent.click(screen.getByText('ذخیره'));
@@ -40,10 +40,10 @@ describe('FreeVisitPrice — الزامی کردن هزینه ویزیت', () =>
   it('toggle فعال + قیمت معتبر → PUT با هر دو کلید (تومان → ریال)', async () => {
     get.mockResolvedValue(pricing(0, false));
     renderWithProviders(<FreeVisitPrice />);
-    await waitFor(() => expect(screen.getByRole('spinbutton')).toHaveValue(0));
+    await waitFor(() => expect(screen.getByRole('textbox')).toHaveValue('0'));
 
     fireEvent.click(screen.getByRole('switch', { name: 'الزامی کردن هزینه ویزیت' }));
-    fireEvent.change(screen.getByRole('spinbutton'), { target: { value: '50000' } });
+    fireEvent.change(screen.getByRole('textbox'), { target: { value: '50000' } });
     fireEvent.click(screen.getByText('ذخیره'));
 
     await waitFor(() => expect(put).toHaveBeenCalledWith('/api/v1/insurance-pricing', {
@@ -55,7 +55,7 @@ describe('FreeVisitPrice — الزامی کردن هزینه ویزیت', () =>
   it('toggle غیرفعال + قیمت صفر → رفتار قبلی حفظ می‌شود (ارسال مجاز)', async () => {
     get.mockResolvedValue(pricing(0, false));
     renderWithProviders(<FreeVisitPrice />);
-    await waitFor(() => expect(screen.getByRole('spinbutton')).toHaveValue(0));
+    await waitFor(() => expect(screen.getByRole('textbox')).toHaveValue('0'));
 
     fireEvent.click(screen.getByText('ذخیره'));
 
@@ -71,6 +71,6 @@ describe('FreeVisitPrice — الزامی کردن هزینه ویزیت', () =>
 
     await waitFor(() => expect(screen.getByRole('switch', { name: 'الزامی کردن هزینه ویزیت' })).toBeChecked());
     expect(screen.getByText('قیمت (تومان)').querySelector('span')?.textContent).toContain('*');
-    expect(screen.getByRole('spinbutton')).toHaveValue(50_000);
+    expect(screen.getByRole('textbox')).toHaveValue('50000');
   });
 });