chore: apply ESLint auto-fix across entire backend

Reformats code style (line breaks, indentation, type annotations)
without changing logic. Also includes minor feature additions bundled
in the same lint run (stats service, user-settings groups, agrarmonitor
polling improvements).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

paperless-backend/src/postprocessing/postprocessing.module.ts

@@ -11,7 +11,12 @@ import { PaperlessModule } from '../paperless/paperless.module';
 
 @Module({
   imports: [
-    TypeOrmModule.forFeature([Postprocessing, PostprocessingAction, PostprocessingLog, ExportTarget]),
+    TypeOrmModule.forFeature([
+      Postprocessing,
+      PostprocessingAction,
+      PostprocessingLog,
+      ExportTarget,
+    ]),
     forwardRef(() => PaperlessModule),
   ],
   providers: [PostprocessingService, MailService, ExportService],