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/NewAppointmentDrawer.tsx

@@ -9,7 +9,7 @@ import PersianDateInput from './ui/PersianDateInput';
 import PriceInput from './ui/PriceInput';
 import SearchableSelect from './ui/SearchableSelect';
 import { WalletChargeLink } from './AppointmentActions';
-import { tehranWallClockToUnix, tomanToRial, rialToToman, toEnglishDigits, sanitizeMobileInput } from '../lib/utils';
+import { tehranWallClockToUnix, tomanToRial, rialToToman, digitsOnly, sanitizeMobileInput } from '../lib/utils';
 
 interface Option { uuid: string; name?: string; full_name?: string }
 interface PatientRow { uuid: string; user_name?: string; user_mobile?: string; user_national_code?: string }
@@ -210,7 +210,7 @@ export default function NewAppointmentDrawer({ doctorUuid, defaultDate, queryKey
             </div>
             <label style={label}>کد ملی</label>
             <div className="field" style={{ margin: '6px 0 12px' }}>
-              <input value={nationalCode} onChange={e => setNationalCode(toEnglishDigits(e.target.value).replace(/\D/g, '').slice(0, 10))}
+              <input value={nationalCode} onChange={e => setNationalCode(digitsOnly(e.target.value, 10))}
                 placeholder="کد ملی مراجعه کننده را وارد نمایید" dir="ltr" inputMode="numeric" lang="en" maxLength={10} />
             </div>
           </>
@@ -315,7 +315,7 @@ export default function NewAppointmentDrawer({ doctorUuid, defaultDate, queryKey
           <>
             <label style={label}>زمان پیش فرض (دقیقه)</label>
             <div className="field" style={{ margin: '6px 0 10px' }}>
-              <input aria-label="زمان پیش فرض" type="number" min={5} value={duration} onChange={e => setDuration(Math.max(5, Number(e.target.value) || 0))} dir="ltr" />
+              <input aria-label="زمان پیش فرض" type="text" inputMode="numeric" value={duration} onChange={e => setDuration(Math.max(5, Number(digitsOnly(e.target.value)) || 0))} dir="ltr" />
             </div>
             {!isReserve && (
               <div style={{ display: 'grid', gridTemplateColumns: '1fr 1fr', gap: 10, marginBottom: 12 }}>