Refactor doctor name handling across the application

- Removed the "دکتر" prefix from doctor names in various components and API responses to ensure consistency and clarity.
- Updated the AppointmentDetailPage, CommentsPage, DashboardPage, RatingsPage, SecretariesPage, and other relevant files to reflect the changes in doctor name formatting.
- Adjusted API documentation to align with the new naming conventions.
- Implemented validation to prevent the creation of clinics without a name and restricted users to a single clinic.
- Added tests to verify that doctor names are stored without titles and that clinic creation adheres to the new validation rules.

assets/admin/pages/SecretariesPage.tsx

@@ -186,7 +186,7 @@ export default function SecretariesPage() {
   const columns: Column<Secretary>[] = [
     { key: 'user_name', header: 'نام', render: (s) => <b>{s.user_name}</b> },
     { key: 'mobile_number', header: 'موبایل', render: (s) => <span dir="ltr">{maskMobile(s.mobile_number)}</span> },
-    { key: 'doctor_name', header: 'پزشک', render: (s) => `دکتر ${s.doctor_name}` },
+    { key: 'doctor_name', header: 'پزشک', render: (s) => s.doctor_name },
     { key: 'is_active', header: 'وضعیت', render: (s) => <ActiveBadge active={s.is_active} /> },
     { key: 'created_at', header: 'تاریخ ثبت', render: (s) => formatDate(s.created_at) },
   ];