feat(attachments): ensure 'key' is set as UUID on attachment creation and update tests for key validation

app/Domains/Attachable/Models/Attachment.php

@@ -12,6 +12,7 @@ use Illuminate\Support\Str;
 #[Fillable([
     'attachable_type',
     'attachable_id',
+    'key',
     'path',
     'filename',
     'type',
@@ -28,7 +29,9 @@ class Attachment extends Model
     protected static function booted(): void
     {
         static::creating(function (self $attachment): void {
-            $attachment->key = (string) Str::uuid();
+            if (! $attachment->key) {
+                $attachment->key = (string) Str::uuid();
+            }
         });
     }