change default spatie guard name to api

app/Models/User.php

@@ -27,6 +27,8 @@ class User extends Authenticatable
         'email_verified_at' => 'datetime',
     ];
 
+    protected function getDefaultGuardName(): string { return 'api'; }
+
     public function medical_center(): BelongsTo
     {
         return $this->belongsTo(MedicalCenter::class);