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/LogsPage.tsx

@@ -10,6 +10,7 @@ import Pagination from '../components/ui/Pagination';
 import Modal from '../components/ui/Modal';
 import ConfirmDialog from '../components/ui/ConfirmDialog';
 import SearchableSelect from '../components/ui/SearchableSelect';
+import { digitsOnly } from '../lib/utils';
 
 const LEVEL_META: Record<string, { label: string; cls: string }> = {
   emergency: { label: 'اضطراری', cls: 'red' },
@@ -254,11 +255,12 @@ function RetentionSettings() {
             </label>
             <input
               className="input"
-              type="number"
-              min={0}
+              type="text"
+              inputMode="numeric"
+              dir="ltr"
               value={value}
               placeholder={settingsQuery.isLoading ? 'در حال بارگذاری...' : '90'}
-              onChange={(e) => { setDays(e.target.value); setTouched(true); }}
+              onChange={(e) => { setDays(digitsOnly(e.target.value)); setTouched(true); }}
               style={{ maxWidth: 200 }}
             />
             <div className="muted" style={{ fontSize: 12, marginTop: 6, lineHeight: 1.7 }}>