fix: enhance page import (#1570)

* change import process

* fix processor

* fix page name in notion import

* preserve confluence table bg color

* sync

apps/server/src/integrations/import/services/import-attachment.service.ts

@@ -35,7 +35,7 @@ interface DrawioPair {
 @Injectable()
 export class ImportAttachmentService {
   private readonly logger = new Logger(ImportAttachmentService.name);
-  private readonly CONCURRENT_UPLOADS = 1;
+  private readonly CONCURRENT_UPLOADS = 3;
   private readonly MAX_RETRIES = 2;
   private readonly RETRY_DELAY = 2000;