feat: unify doctor title handling and enhance specialty selection

- Implemented a helper function `displayDoctorName` to prepend "دکتر" to doctor names for consistent display across the application.
- Updated various components (InviteDoctorModal, DashboardPage, DoctorDetailPage, DoctorsPage, etc.) to utilize the new helper for rendering doctor names.
- Modified the DoctorFormPage to automatically add the "دکتر" title in the UI without requiring user input.
- Fixed the EditSpecialtyPicker component to allow multiple specialty selections, resolving a UI bug where only one specialty could be selected at a time.
- Ensured that the backend strips the "دکتر" title from the name during pre-registration and doctor creation processes.
- Added tests for the new functionality, including checks for title handling and specialty selection logic.
- Updated API documentation to reflect changes in name handling and display logic.

tests/Shared/PersianTextTest.php

@@ -38,4 +38,16 @@ class PersianTextTest extends TestCase
     {
         $this->assertFalse(PersianText::sameName('علی اکبری', 'ولی اکبری'));
     }
+
+    public function testWithDoctorTitlePrependsExactlyOnce(): void
+    {
+        $this->assertSame('دکتر فرخنده حسینی', PersianText::withDoctorTitle('فرخنده حسینی'));
+        // نامِ از پیش عنوان‌دار «دکتر دکتر …» نمی‌شود
+        $this->assertSame('دکتر فرخنده حسینی', PersianText::withDoctorTitle('دکتر فرخنده حسینی'));
+        $this->assertSame('دکتر فرخنده حسینی', PersianText::withDoctorTitle('دکتر دکتر فرخنده حسینی'));
+        // خالی/نال → رشتهٔ خالی (نه «دکتر» تنها)
+        $this->assertSame('', PersianText::withDoctorTitle(''));
+        $this->assertSame('', PersianText::withDoctorTitle(null));
+        $this->assertSame('', PersianText::withDoctorTitle('   '));
+    }
 }