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/Controllers/Api/Admin/Setting/SettingController.php

@@ -8,8 +8,8 @@ use App\Http\Controllers\Controller;
 use App\Http\Facade\SignRSA;
 use App\Http\Services\Telegram;
 use App\Models\Setting;
-use App\Support\Cache\CacheKey;
 use App\Support\PublicSetting;
+use App\Support\MailSettings;
 use App\Support\Turnstile;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
@@ -115,8 +115,7 @@ class SettingController extends Controller
                 ['value' => json_encode($merged, JSON_UNESCAPED_UNICODE)]
             );
 
-            // Flush mail config cache so new SMTP settings take effect immediately
-            Cache::forget(CacheKey::build('settings', 'mail'));
+            Cache::forget(MailSettings::cacheKey());
         }
 
         if ($request->has('turnstile')) {