feat(settings): render doctor/clinic settings pages inside the settings shell

Wrap the existing settings-area pages — doctor profile (مدیریت پزشک),
insurance pricing (بیمه), payment report (پرداخت), SMS wallet (پیامک‌ها),
secretaries (منشی) and clinic info (مطب) — in SettingsLayout so they appear
under the settings sub-navigation like the Figma design, with the matching
menu item highlighted. Wire the doctor/clinic menu entries to their routes.

The نوبت‌دهی / برچسب‌ها / حساب کاربری entries stay as disabled placeholders
until they have their own pages/designs.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

assets/admin/pages/SmsWalletPage.tsx

@@ -2,6 +2,7 @@ import React, { useState, useEffect } from 'react';
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
 import { useForm } from 'react-hook-form';
 import { zodResolver } from '@hookform/resolvers/zod';
+import SettingsLayout from '../components/layout/SettingsLayout';
 import { z } from 'zod';
 import { toast } from 'sonner';
 import {
@@ -565,8 +566,10 @@ function SmsWalletPageInner() {
 
 export default function SmsWalletPage() {
   return (
-    <FeatureGate feature="sms_panel">
-      <SmsWalletPageInner />
-    </FeatureGate>
+    <SettingsLayout active="sms">
+      <FeatureGate feature="sms_panel">
+        <SmsWalletPageInner />
+      </FeatureGate>
+    </SettingsLayout>
   );
 }