fix: add missing RoleService import and improve admin buttons layout

- Fixed UnboundLocalError by importing RoleService before use
- Changed action buttons to vertical stack layout to prevent overlap
- Buttons now use flexbox column layout with proper spacing

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

myproject/tenants/admin.py

@@ -144,8 +144,10 @@ class TenantRegistrationAdmin(admin.ModelAdmin):
         if obj.status == TenantRegistration.STATUS_PENDING:
             approve_url = reverse('admin:tenants_tenantregistration_change', args=[obj.pk])
             return format_html(
-                '<a class="button" href="{}?approve=1" style="background: #417690; color: white; padding: 5px 10px; text-decoration: none; border-radius: 3px; margin-right: 5px;">Активировать</a> '
-                '<a class="button" href="{}?reject=1" style="background: #ba2121; color: white; padding: 5px 10px; text-decoration: none; border-radius: 3px;">Отклонить</a>',
+                '<div style="display: flex; flex-direction: column; gap: 5px; min-width: 140px;">'
+                '<a class="button" href="{}?approve=1" style="background: #417690; color: white; padding: 5px 10px; text-decoration: none; border-radius: 3px; text-align: center; display: block; white-space: nowrap;">Активировать</a>'
+                '<a class="button" href="{}?reject=1" style="background: #ba2121; color: white; padding: 5px 10px; text-decoration: none; border-radius: 3px; text-align: center; display: block; white-space: nowrap;">Отклонить</a>'
+                '</div>',
                 approve_url, approve_url
             )
         elif obj.status == TenantRegistration.STATUS_APPROVED:
@@ -350,6 +352,7 @@ class TenantRegistrationAdmin(admin.ModelAdmin):
                 # Назначаем роль owner владельцу
                 try:
                     from user_roles.models import Role
+                    from user_roles.services import RoleService
                     RoleService.assign_role_to_user(owner, Role.OWNER, created_by=None)
                     logger.info(f"Роль owner назначена владельцу {owner.email}")
                 except Exception as e: