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/SettingsPage.tsx

@@ -6,6 +6,7 @@ import { zodResolver } from '@hookform/resolvers/zod';
 import { api } from '../lib/api';
 import type { ApiResponse } from '../lib/api';
 import { formatDateTime, rialToToman, tomanToRial } from '../lib/utils';
+import { numericField } from '../lib/forms';
 import {
   Cog6ToothIcon, ClockIcon, CalculatorIcon, CreditCardIcon, ChatBubbleLeftRightIcon,
   MagnifyingGlassIcon, CheckCircleIcon, ExclamationTriangleIcon, EyeIcon, EyeSlashIcon,
@@ -316,13 +317,13 @@ export default function SettingsPage() {
               <div className="settings-grid">
                 <Field label="مهلت مجاز لغو نوبت" hint="بیمار تا این تعداد ساعت پیش از نوبت اجازه لغو دارد.">
                   <div className="input-suffix">
-                    <input {...register('max_cancel_hours_before')} type="number" min={0} className="input" style={{ maxWidth: 130 }} />
+                    <input {...numericField(register('max_cancel_hours_before'))} className="input" style={{ maxWidth: 130 }} />
                     <span className="suf">ساعت قبل</span>
                   </div>
                 </Field>
                 <Field label="ارسال یادآور نوبت" hint="پیامک یادآوری این تعداد ساعت پیش از نوبت ارسال می‌شود.">
                   <div className="input-suffix">
-                    <input {...register('appointment_reminder_hours')} type="number" min={0} className="input" style={{ maxWidth: 130 }} />
+                    <input {...numericField(register('appointment_reminder_hours'))} className="input" style={{ maxWidth: 130 }} />
                     <span className="suf">ساعت قبل</span>
                   </div>
                 </Field>
@@ -353,7 +354,7 @@ export default function SettingsPage() {
                     {upgradeCommissionEnabled && (
                       <div className="toggle-sub">
                         <div className="input-suffix">
-                          <input {...register('upgrade_commission_percent')} type="number" min={0} max={100} className="input" style={{ maxWidth: 120 }} />
+                          <input {...numericField(register('upgrade_commission_percent'), 3)} className="input" style={{ maxWidth: 120 }} />
                           <span className="suf">درصد (۰–۱۰۰)</span>
                         </div>
                       </div>
@@ -370,7 +371,7 @@ export default function SettingsPage() {
                     {taxEnabled && (
                       <div className="toggle-sub">
                         <div className="input-suffix">
-                          <input {...register('tax_percent')} type="number" min={0} max={100} className="input" style={{ maxWidth: 120 }} />
+                          <input {...numericField(register('tax_percent'), 3)} className="input" style={{ maxWidth: 120 }} />
                           <span className="suf">درصد (۰–۱۰۰)</span>
                         </div>
                       </div>
@@ -396,13 +397,13 @@ export default function SettingsPage() {
                 <div className="settings-grid" style={{ marginTop: 18 }}>
                   <Field label="مبلغ هر نوبت" hint="مبلغی که بیمار هنگام رزرو آنلاین پرداخت می‌کند (تومان).">
                     <div className="input-suffix">
-                      <input {...register('appointment_fee_rials')} type="number" min={0} dir="ltr" className="input" style={{ maxWidth: 200 }} placeholder="15000" />
+                      <input {...numericField(register('appointment_fee_rials'))} className="input" style={{ maxWidth: 200 }} placeholder="15000" />
                       <span className="suf">تومان</span>
                     </div>
                   </Field>
                   <Field label="هزینه ثابت پنل پیامک" hint="از مبلغ هر تراکنش کسر می‌شود (تومان).">
                     <div className="input-suffix">
-                      <input {...register('sms_panel_fee_rials')} type="number" min={0} dir="ltr" className="input" style={{ maxWidth: 200 }} placeholder="150000" />
+                      <input {...numericField(register('sms_panel_fee_rials'))} className="input" style={{ maxWidth: 200 }} placeholder="150000" />
                       <span className="suf">تومان</span>
                     </div>
                   </Field>
@@ -492,7 +493,7 @@ export default function SettingsPage() {
                   </div>
                 </Field>
                 <Field label="هزینه هر پیامک" hint="مبلغ کسرشده از کیف پول به ازای هر پیامک ارسالی (تومان). مبنای محاسبهٔ تعداد پیامک از موجودی.">
-                  <input {...register('sms_price_rials')} type="number" min={0} dir="ltr" className="input" style={{ maxWidth: 200 }} placeholder="50" />
+                  <input {...numericField(register('sms_price_rials'))} className="input" style={{ maxWidth: 200 }} placeholder="50" />
                 </Field>
               </div>
             )}