chore: upgrade nodemailer 7.x to 8.0.1

Nodemailer 8 improvements:
- Better socket cleanup (prevents memory leaks)
- Hardened DNS fallback against race conditions
- Gmail Workspace service configuration support
- Improved TLS error handling
- Centralized error codes

Only breaking change: error code 'NoAuth' renamed to 'ENOAUTH'
(not used in our codebase - verified with grep)

Author: Schero94

package-lock.json

@@ -55,7 +55,7 @@
     "form-data": "^4.0.4",
     "html-to-text": "^9.0.5",
     "mustache": "^4.2.0",
-    "nodemailer": "^7.0.12",
+    "nodemailer": "^8.0.1",
     "pino": "^9.5.0",
     "qrcode": "^1.5.4",
     "react-email-editor": "^1.7.11",