feat: add doctor invitation modal and appointment creation API

- Implemented InviteDoctorModal component for inviting doctors to clinics.
- Updated ClinicDashboard to include a button for inviting doctors and handle modal state.
- Added createAppointment API endpoint in AdminApiController for scheduling appointments.
- Enhanced ClinicInvitationController to check user access when inviting doctors.
- Updated MyAppointmentsController to ensure unique appointment records.
- Added seed_test_data.php for populating test data including doctors, clinics, and appointments.
- Refactored styles to include new appointment status badges and updated font imports.

assets/admin/components/layout/Sidebar.tsx

@@ -73,7 +73,6 @@ function buildSections(primaryRole: string | null, dbUuid: string | null): Secti
                 items: [
                     { to: '/admin/dashboard', icon: ChartBarIcon, label: 'داشبورد' },
                     { to: clinicTo, icon: BuildingOffice2Icon, label: 'کلینیک من' },
-                    { to: '/admin/doctors', icon: HeartIcon, label: 'پزشکان' },
                 ],
             },
             {