feat: enhance DoctorFormPage with searchable specialties and improved UI components

- Refactored DoctorFormPage to use Controller from react-hook-form for better form handling.
- Added a new Field component for consistent input styling and error handling.
- Implemented a SpecialtyPicker component with improved selection logic for specialties.
- Updated the layout and styling of the form sections for better user experience.
- Integrated SearchableSelect for selecting specialties and roles in DoctorsPage and UsersPage.
- Added createClinic API endpoint to handle clinic creation with validation for mobile and name fields.

assets/admin/pages/RepresentationDetailPage.tsx

@@ -11,6 +11,7 @@ import PageHeader from '../components/ui/PageHeader';
 import { ActiveBadge } from '../components/ui/StatusBadge';
 import ConfirmDialog from '../components/ui/ConfirmDialog';
 import Modal from '../components/ui/Modal';
+import SearchableSelect from '../components/ui/SearchableSelect';
 
 function DetailRow({ label, value }: { label: string; value: React.ReactNode }) {
   return (
@@ -244,16 +245,13 @@ export default function RepresentationDetailPage() {
           </div>
           <div>
             <label className="">شهر</label>
-            <select
-              value={formData.city_id}
-              onChange={(e) => setFormData((p) => ({ ...p, city_id: e.target.value }))}
-              className="cp-input h-11"
-            >
-              <option value="">انتخاب شهر</option>
-              {cities.map((c) => (
-                <option key={c.id} value={String(c.id)}>{c.name}</option>
-              ))}
-            </select>
+            <SearchableSelect
+              options={cities.map(c => ({ value: String(c.id), label: c.name }))}
+              value={formData.city_id || null}
+              onChange={(v) => setFormData(p => ({ ...p, city_id: v ? String(v) : '' }))}
+              placeholder="انتخاب شهر"
+              isClearable
+            />
           </div>
           <div>
             <label className="">موبایل</label>