feat: refactor clinic management into a dedicated settings tab

- Removed MyClinicPage and redirected its functionality to a new ClinicDoctorsPage.
- Created ClinicDoctorsManager component for managing doctors and invitations within the settings layout.
- Updated backend permissions to allow clinic owners to detach doctors, alongside admins.
- Adjusted API documentation to reflect new permission structure.
- Updated tests to cover new functionality and permissions.
- Modified sidebar and settings menu to reflect the new structure and role-based visibility.

assets/admin/components/layout/SettingsLayout.tsx

@@ -23,7 +23,7 @@ export const SETTINGS_MENU: SettingsMenuItem[] = [
   { key: 'subscription', label: 'خرید اشتراک',       icon: CreditCardIcon,           to: '/admin/subscription' },
   { key: 'doctor',       label: 'مدیریت پزشک',        icon: UserIcon,                 to: '/admin/profile',              roles: ['doctor'] },
   { key: 'appointment',  label: 'مدیریت نوبت دهی',    icon: CalendarDaysIcon,         to: '/admin/appointment-settings', roles: ['doctor'] },
-  { key: 'clinic',       label: 'مدیریت مطب',         icon: BuildingOffice2Icon,      to: '/admin/my-clinic',            roles: ['clinic'] },
+  { key: 'clinic-doctors', label: 'پزشکان کلینیک',    icon: BuildingOffice2Icon,      to: '/admin/settings/clinic-doctors', roles: ['clinic'] },
   { key: 'payment',      label: 'مدیریت پرداخت',      icon: BanknotesIcon,            to: '/admin/my-financial' },
   { key: 'secretary',    label: 'مدیریت منشی',        icon: UsersIcon,                to: '/admin/my-secretaries' },
   { key: 'staff',        label: 'پرسنل',              icon: UserPlusIcon,             to: '/admin/staff' },