feat(admin): IP pool allocation, billing exports, service attachments

- IP pool: sheet import (xlsx/csv) matched by address, bulk allocate/revoke
  with notification email (ip_allocated/ip_revoked), ip_pool_logs history.
- Orders/invoices: Excel export on branded template (BrandedReportWriter),
  shared billing filters, order item service info in list responses.
- Web design quote Excel export; activity log export.
- Service attachments with copy-to-invoice; deployment invoice attachments.
- Customer email attachments stored on disk and attached by path.
- Admin password change endpoint; user.fullname backfill migration;
  orders.user_id backfill from logs.
- Disable deploy workflow until CI/CD is set up.
- Ignore stored customer email and service attachment uploads.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

database/factories/UserFactory.php

@@ -18,8 +18,6 @@ class UserFactory extends Factory
     public function definition()
     {
         return [
-            // Bảng `user` dùng một cột `fullname`; firstname/lastname không tồn tại nên mọi
-            // test cần tài khoản admin đều chết ở đây với "Unknown column 'firstname'".
             'fullname' => 'System Admin',
             'username' => "admin",
             'email' => 'admin@tgs.com.vn',