Revert "fix: resolve all ESLint errors in backend and frontend"

This reverts commit 07dfd7e840.

paperless-backend/src/webhook/webhook.controller.ts

@@ -20,9 +20,9 @@ export class WebhookController {
   @Public()
   @Post('paperless')
   @HttpCode(HttpStatus.OK)
-  handlePaperlessWebhook(@Body() payload: PaperlessWebhookPayload): {
-    status: string;
-  } {
+  async handlePaperlessWebhook(
+    @Body() payload: PaperlessWebhookPayload,
+  ): Promise<{ status: string }> {
     this.logger.log(
       `Webhook empfangen: action=${payload.action}, document=${payload.document_id}`,
     );