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/postprocessing/mail.service.ts

@@ -25,12 +25,24 @@ export class MailService {
     body: string;
     html?: string;
     attachments?: { filename: string; content: Buffer }[];
-    smtpOverride?: { host: string; port: number; secure: boolean; user: string; pass: string; from: string };
+    smtpOverride?: {
+      host: string;
+      port: number;
+      secure: boolean;
+      user: string;
+      pass: string;
+      from: string;
+    };
   }): Promise<void> {
     let transporter = this.transporter;
-    const globalFromEmail = this.configService.get<string>('SMTP_FROM', 'paperless@localhost');
+    const globalFromEmail = this.configService.get<string>(
+      'SMTP_FROM',
+      'paperless@localhost',
+    );
     const globalFromName = this.configService.get<string>('SMTP_FROM_NAME', '');
-    let from = globalFromName ? `"${globalFromName}" <${globalFromEmail}>` : globalFromEmail;
+    let from = globalFromName
+      ? `"${globalFromName}" <${globalFromEmail}>`
+      : globalFromEmail;
 
     if (options.smtpOverride) {
       const o = options.smtpOverride;
@@ -53,7 +65,7 @@ export class MailService {
       subject: options.subject,
       text: options.body,
       html: options.html,
-      attachments: options.attachments?.map(a => ({
+      attachments: options.attachments?.map((a) => ({
         filename: a.filename,
         content: a.content,
       })),