fix(email): change default SMTP port and disable connection pooling

Force IPv4 connections and disable pooling to debug connection issues.
Use type assertion to resolve TypeScript compatibility with nodemailer options.

src/notifications/email.service.ts

@@ -10,9 +10,11 @@ export class EmailService {
   constructor(private readonly configService: ConfigService) {
     this.transporter = nodemailer.createTransport({
       host: this.configService.get("SMTP_HOST"),
-      port: parseInt(this.configService.get("SMTP_PORT") || "465", 10),
+      port: parseInt(this.configService.get("SMTP_PORT") || "587", 10),
       secure: this.configService.get("SMTP_SECURE") === "true",
-      pool: true,
+      family: 4, // Force IPv4
+      pool: false, // Turn off pool to debug fresh connections
+
       maxConnections: 5,
       maxMessages: 100,
       connectionTimeout: 20000,
@@ -27,7 +29,7 @@ export class EmailService {
       tls: {
         rejectUnauthorized: false, // Help with some SMTP issues
       },
-    });
+    } as any);
   }
 
   async sendEmail(