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>

app/Models/InvoiceAttachment.php

@@ -9,6 +9,7 @@ class InvoiceAttachment extends Model
 {
     public const TYPE_PAYMENT_PROOF = 'payment_proof';
     public const TYPE_DEPLOYMENT = 'deployment';
+    public const UPLOAD_RULE = 'required|file|mimes:jpg,jpeg,png,gif,webp,pdf,doc,docx,xls,xlsx|max:51200';
 
     protected $table = 'invoice_attachments';