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/stats/stats.module.ts

@@ -7,11 +7,7 @@ import { InboxModule } from '../inbox/inbox.module';
 import { PaperlessModule } from '../paperless/paperless.module';
 
 @Module({
-  imports: [
-    TypeOrmModule.forFeature([Email]),
-    InboxModule,
-    PaperlessModule,
-  ],
+  imports: [TypeOrmModule.forFeature([Email]), InboxModule, PaperlessModule],
   controllers: [StatsController],
   providers: [StatsService],
   exports: [StatsService],