fix: use LOGIN auth method for SMTP (mailcow compatibility)

src/auth/auth.service.ts

@@ -7,6 +7,7 @@ import { JwtService } from '@nestjs/jwt';
 import { ConfigService } from '@nestjs/config';
 import { PrismaService } from '../prisma/prisma.service';
 import { nanoid } from 'nanoid';
+import * as nodemailer from 'nodemailer';
 
 @Injectable()
 export class AuthService {
@@ -29,8 +30,46 @@ export class AuthService {
       },
     });
 
-    // TODO: integrate real email service (SMTP, SendGrid, etc.)
+    const smtpHost = this.config.get<string>('SMTP_HOST');
+    const smtpPort = this.config.get<number>('SMTP_PORT', 587);
+    const smtpUser = this.config.get<string>('SMTP_USER');
+    const smtpPass = this.config.get<string>('SMTP_PASS');
+    const mailFrom = this.config.get<string>(
+      'MAIL_FROM',
+      'radiOLA <noreply@nexaweb.su>',
+    );
+
+    if (smtpHost && smtpUser && smtpPass) {
+      try {
+        const transporter = nodemailer.createTransport({
+          host: smtpHost,
+          port: smtpPort,
+          secure: smtpPort === 465,
+          auth: {
+            user: smtpUser,
+            pass: smtpPass,
+          },
+          authMethod: 'LOGIN',
+          tls: {
+            rejectUnauthorized: false,
+          },
+        });
+
+        await transporter.sendMail({
+          from: mailFrom,
+          to: email,
+          subject: 'Ваш код подтверждения radiOLA',
+          text: `Ваш код подтверждения: ${code}\n\nКод действителен 15 минут.`,
+          html: `<p>Ваш код подтверждения: <strong>${code}</strong></p><p>Код действителен 15 минут.</p>`,
+        });
+      } catch (error) {
+        console.error('Failed to send email:', error.message);
+        // Fallback to console log for debugging
         console.log(`Magic link code for ${email}: ${code}`);
+      }
+    } else {
+      console.log(`Magic link code for ${email}: ${code}`);
+    }
 
     return { message: 'Check your email for the verification code.' };
   }