refactor(attachments): remove is_public field from Attachment model and migration

app/Domains/Attachable/Models/Attachment.php

@@ -14,7 +14,6 @@ use Illuminate\Database\Eloquent\Relations\MorphTo;
     'filename',
     'type',
     'mime_type',
-    'is_public',
     'extension',
     'size',
 ])]
@@ -28,7 +27,6 @@ class Attachment extends Model
     {
         return [
             'attachable_id' => 'integer',
-            'is_public' => 'boolean',
             'size' => 'integer',
         ];
     }

database/migrations/2026_06_25_000500_create_attachments_table.php

@@ -19,7 +19,6 @@ return new class extends Migration
             $table->string('filename');
             $table->string('type')->nullable();
             $table->string('mime_type');
-            $table->boolean('is_public')->default(false);
             $table->string('extension', 20)->nullable();
             $table->unsignedBigInteger('size')->default(0);
             $table->timestamps();