feat: driver documents (sovereignty storage adapter) + load-test script

- documents: upload (multipart) + review (admin/CS) + auto-approve driver when all docs approved
- StorageService: per-tenant local volume now, in-country storage swap via STORAGE_BASE_URL
- doc.number encrypted (AES-256-GCM); migration InitDocuments; tripz-storage volume
- scripts/loadtest.mjs: concurrent full trip-cycle benchmark (throughput + latency percentiles)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/src/app.module.ts

@@ -25,6 +25,8 @@ import { DispatchModule } from './modules/dispatch/dispatch.module';
 import { WalletModule } from './modules/wallet/wallet.module';
 import { NotificationsModule } from './modules/notifications/notifications.module';
 import { PaymentsModule } from './modules/payments/payments.module';
+import { StorageModule } from './common/storage/storage.module';
+import { DocumentsModule } from './modules/documents/documents.module';
 
 @Module({
   imports: [
@@ -51,6 +53,7 @@ import { PaymentsModule } from './modules/payments/payments.module';
     RedisModule, // عالمي — عميل Redis للمطابقة و OTP
     NabehModule, // عالمي — إرسال OTP واتساب
     NotificationsModule, // عالمي — FCM
+    StorageModule, // عالمي — تخزين ملفات الوثائق
 
     HealthModule,
     TenantsModule,
@@ -69,6 +72,7 @@ import { PaymentsModule } from './modules/payments/payments.module';
     DispatchModule,
     ChatModule,
     RatingsModule,
+    DocumentsModule,
     SeedModule,
   ],
 })