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/preprocessing/pdf.service.ts

@@ -60,18 +60,22 @@ export class PdfService {
 
     const entries = await fs.readdir(tmpDir);
     const images = entries
-      .filter(f => f.endsWith('.png'))
+      .filter((f) => f.endsWith('.png'))
       .sort((a, b) => {
         const numA = parseInt(a.match(/\d+/)?.[0] ?? '0', 10);
         const numB = parseInt(b.match(/\d+/)?.[0] ?? '0', 10);
         return numA - numB;
       })
-      .map(f => path.join(tmpDir, f));
+      .map((f) => path.join(tmpDir, f));
 
     if (images.length === 0) {
-      this.logger.warn(`Ghostscript hat keine Seiten erstellt: ${pdfPath} — Verzeichnisinhalt: [${entries.join(', ')}]`);
+      this.logger.warn(
+        `Ghostscript hat keine Seiten erstellt: ${pdfPath} — Verzeichnisinhalt: [${entries.join(', ')}]`,
+      );
     } else {
-      this.logger.debug(`PDF konvertiert: ${images.length} Seite(n) in ${tmpDir}`);
+      this.logger.debug(
+        `PDF konvertiert: ${images.length} Seite(n) in ${tmpDir}`,
+      );
     }
 
     return images;
@@ -114,7 +118,9 @@ export class PdfService {
   async cleanup(imagePaths: string[]): Promise<void> {
     const dirs = new Set<string>();
     for (const imgPath of imagePaths) {
-      try { await fs.unlink(imgPath); } catch {}
+      try {
+        await fs.unlink(imgPath);
+      } catch {}
       dirs.add(path.dirname(imgPath));
     }
     for (const dir of dirs) {