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/Http/Requests/BillingExportRequest.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace App\Http\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class BillingExportRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'filter' => 'nullable|string|max:255',
+            'status' => 'nullable|array',
+            'status.*' => 'integer|between:0,5',
+            'date_from' => 'nullable|date',
+            'date_to' => 'nullable|date|after_or_equal:date_from',
+            'customer_id' => 'nullable|integer',
+            'payment_method' => 'nullable|string|max:50',
+            'invoice_type' => 'nullable|integer|in:1,2,3',
+        ];
+    }
+}