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.

package-lock.json

@@ -6,6 +6,7 @@
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