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/Exports/Concerns/FormatsBillingCells.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace App\Exports\Concerns;
+
+use App\Models\Order;
+use Carbon\Carbon;
+
+trait FormatsBillingCells
+{
+    private function describeServices(?Order $order): string
+    {
+        return ($order?->orderItems ?? collect())
+            ->map(function ($item) {
+                $name = $item->service?->server_name ?: $item->server_name ?: $item->domain_name ?: $item->product?->name;
+
+                return $item->service
+                    ? "#{$item->service->id} {$name} ({$item->service->status_label})"
+                    : "{$name} (chưa có dịch vụ)";
+            })
+            ->implode("\n");
+    }
+
+    private function formatDate(mixed $value, string $format = 'd/m/Y'): ?string
+    {
+        return $value ? Carbon::parse($value)->format($format) : null;
+    }
+
+    private function paymentMethodLabel(?string $method): ?string
+    {
+        return match ($method) {
+            'transfer' => 'Chuyển khoản',
+            'balance' => 'Trừ số dư',
+            default => $method,
+        };
+    }
+}