refactor: Replace fillable properties with guarded properties in Contact model for improved security and data handling.

app/Models/Contact.php

@@ -10,15 +10,7 @@ class Contact extends Model
 {
     use HasHashid;
 
-    protected $fillable = [
+    protected $guarded = ['id'];
-        'name',
-        'email',
-        'subject',
-        'message',
-        'reply_message',
-        'replied_at',
-        'replied_by',
-    ];
 
     public function repliedBy(): BelongsTo
     {