fix: resolve test failures for Sanctum auth guard and AttendanceMailerService binding

- Add SanctumServiceProvider explicitly to bootstrap/providers.php
  to ensure sanctum auth driver is registered in CI environments

- Add mockService() to 3 validation tests that were missing it
  (test_record_returns_validation_errors_for_bad_payload,
   test_send_manual_email_validates_payload,
   test_save_notification_note_validates_payload)
  to prevent container resolution failure during middleware gathering

- Update test URLs from /api/attendance-tracking/ to /api/v1/attendance-tracking/
  to match current route structure

bootstrap/providers.php

@@ -2,8 +2,10 @@
 
 use App\Providers\AppServiceProvider;
 use App\Providers\EventServiceProvider;
+use Laravel\Sanctum\SanctumServiceProvider;
 
 return [
     AppServiceProvider::class,
     EventServiceProvider::class,
+    SanctumServiceProvider::class,
 ];