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/email/email.module.ts

@@ -15,7 +15,13 @@ import { PreprocessingModule } from '../preprocessing/preprocessing.module';
 
 @Module({
   imports: [
-    TypeOrmModule.forFeature([Email, Attachment, Content, CorrespondentEmailMapping, Task]),
+    TypeOrmModule.forFeature([
+      Email,
+      Attachment,
+      Content,
+      CorrespondentEmailMapping,
+      Task,
+    ]),
     PaperlessModule,
     PreprocessingModule,
   ],