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/daily-digest/daily-digest.controller.ts

@@ -10,10 +10,18 @@ export class DailyDigestController {
   async sendNow(@Request() req: any) {
     const { userId, email, preferredUsername, groups } = req.user;
     if (!email) {
-      return { ok: false, error: 'Keine E-Mail-Adresse im Benutzerprofil gefunden.' };
+      return {
+        ok: false,
+        error: 'Keine E-Mail-Adresse im Benutzerprofil gefunden.',
+      };
     }
     try {
-      await this.dailyDigestService.sendDigestForUser(userId, email, preferredUsername, groups);
+      await this.dailyDigestService.sendDigestForUser(
+        userId,
+        email,
+        preferredUsername,
+        groups,
+      );
       return { ok: true };
     } catch (err: any) {
       return { ok: false, error: err.message };