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/DoctorDetailPage.tsx

@@ -33,6 +33,7 @@ import PersianDatePicker from '../components/ui/PersianDatePicker';
 import ImageCropModal from '../components/ImageCropModal';
 import { ScheduleSection } from '../components/schedule/ScheduleSection';
 import type { AddressData } from '../components/schedule/ScheduleSection';
+import { latinDigitsField } from '../lib/forms';
 
 // Fix leaflet default marker icons
 delete (L.Icon.Default.prototype as any)._getIconUrl;
@@ -649,7 +650,7 @@ function AddressModal({ open, onClose, existing, doctorUuid, onSaved }: {
             <label className="block text-sm font-medium text-slate-700 dark:text-slate-300 mb-1.5">
               تلفن <span className="text-red-500">*</span>
             </label>
-            <input type="text" dir="ltr" className="cp-input text-left" placeholder="021..." {...register('telephone')} />
+            <input className="cp-input text-left" placeholder="021..." {...latinDigitsField(register('telephone'))} />
             {errors.telephone && <p className="text-xs text-red-500 mt-1">{errors.telephone.message}</p>}
           </div>
         </div>