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/webhook/webhook.controller.ts

@@ -1,4 +1,11 @@
-import { Controller, Post, Body, Logger, HttpCode, HttpStatus } from '@nestjs/common';
+import {
+  Controller,
+  Post,
+  Body,
+  Logger,
+  HttpCode,
+  HttpStatus,
+} from '@nestjs/common';
 import { Public } from '../auth/public.decorator';
 export interface PaperlessWebhookPayload {
   document_id: number;
@@ -13,8 +20,12 @@ export class WebhookController {
   @Public()
   @Post('paperless')
   @HttpCode(HttpStatus.OK)
-  async handlePaperlessWebhook(@Body() payload: PaperlessWebhookPayload): Promise<{ status: string }> {
-    this.logger.log(`Webhook empfangen: action=${payload.action}, document=${payload.document_id}`);
+  async handlePaperlessWebhook(
+    @Body() payload: PaperlessWebhookPayload,
+  ): Promise<{ status: string }> {
+    this.logger.log(
+      `Webhook empfangen: action=${payload.action}, document=${payload.document_id}`,
+    );
 
     // TODO: Business-Logik für verschiedene Webhook-Events
     // - document_updated → Felder prüfen, Postprocessing auslösen