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/pages/SmsWalletPage.tsx

@@ -20,6 +20,7 @@ import Pagination from '../components/ui/Pagination';
 import SearchableSelect from '../components/ui/SearchableSelect';
 import PageHeader from '../components/ui/PageHeader';
 import FeatureGate from '../components/ui/FeatureGate';
+import { numericField } from '../lib/forms';
 
 const chargeSchema = z.object({
   amount_rials: z.coerce.number().min(1000, 'حداقل مبلغ ۱٬۰۰۰ تومان است'),
@@ -528,9 +529,8 @@ function SmsWalletPageInner() {
             <div className="field">
               <label>مبلغ (تومان)</label>
               <input
-                {...chargeForm.register('amount_rials')}
-                type="number" min={1000}
-                placeholder="50000" dir="ltr"
+                {...numericField(chargeForm.register('amount_rials'))}
+                placeholder="50000"
               />
               {chargeForm.formState.errors.amount_rials && (
                 <span className="field-error">{chargeForm.formState.errors.amount_rials.message}</span>