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.

docs/api/admin.md

@@ -356,7 +356,7 @@ List all doctors with pagination.
   "data": [
     {
       "uuid": "...",
-      "title": "دکتر علی احمدی",
+      "title": "علی احمدی",
       "degree": "متخصص",
       "gender": "male",
       "doctor_rate": 4.5,
@@ -565,7 +565,7 @@ List appointments filtered by date and/or doctor. Sorted by `slot_start ASC`.
       "patient_name": "محمد رضایی",
       "patient_mobile": "09123456789",
       "doctor_uuid": "doctor-uuid",
-      "doctor_name": "دکتر علی احمدی",
+      "doctor_name": "علی احمدی",
       "slot_start": 1718438400,
       "slot_end": 1718439600,
       "appointment_date": "2025-06-15",
@@ -764,7 +764,7 @@ List all settlement requests.
   "data": [
     {
       "uuid": "...",
-      "user": { "uuid": "...", "real_name": "دکتر علی احمدی" },
+      "user": { "uuid": "...", "real_name": "علی احمدی" },
       "amount_rials": 1000000,
       "status": "pending",
       "bank_account": { "bank_name": "بانک ملت", "owner_name": "..." },
@@ -845,7 +845,7 @@ Paginated. Each item:
 {
   "uuid": "...",
   "id": 45,
-  "name": "دکتر علی احمدی",
+  "name": "علی احمدی",
   "gender": "man",
   "medical_code": "12345",
   "is_active": true,
@@ -912,7 +912,7 @@ Paginated. Each item:
   "status": "confirmed",
   "patient_name": "علی رضایی",
   "doctor_uuid": "...",
-  "doctor_name": "دکتر علی احمدی"
+  "doctor_name": "علی احمدی"
 }
 ```
 > `slot_start`/`slot_end` Unix timestamp (ثانیه).
@@ -1160,7 +1160,7 @@ List pre-registration requests. **Permission:** `ROLE_ADMIN`
     {
       "uuid": "...",
       "type": "independent_doctor",
-      "name": "دکتر احمدی",
+      "name": "احمدی",
       "mobile": "09121234567",
       "info": "متخصص داخلی",
       "status": "pending",