refactor(form-builder): pre-publish check reads form_field_bindings; drop binding JSON columns

api/database/seeders/FormBuilderDevSeeder.php

@@ -99,7 +99,7 @@ final class FormBuilderDevSeeder
                     'is_required' => $field['is_required'] ?? false,
                     'is_filterable' => $field['is_filterable'] ?? false,
                     'is_pii' => $field['is_pii'] ?? false,
-                    'binding' => null,
+                    'binding' => null, // Pattern B — snapshot embeds null for form-owned fields.
                     'conditional_logic' => null,
                     'translations' => null,
                     'value_storage_hint' => $field['type']->recommendedValueStorageHint()->value,
@@ -372,7 +372,6 @@ final class FormBuilderDevSeeder
                 'is_admin_only' => false,
                 'is_pii' => false,
                 'display_width' => $def['display_width'] ?? 'full',
-                'binding' => null,
                 'role_restrictions' => null,
                 'value_storage_hint' => $def['value_storage_hint'] ?? FormValueStorageHint::JSON,
                 'sort_order' => $sortOrder + 1,