Send login codes via SMTP using Mailpit-compatible transport

package-lock.json

@@ -18,6 +18,7 @@
         "dotenv": "^17.3.1",
         "express": "^5.2.1",
         "graphql": "^16.13.2",
+        "nodemailer": "^8.0.4",
         "pg": "^8.20.0",
         "zod": "^4.3.6"
       },
@@ -2078,6 +2079,15 @@
       "devOptional": true,
       "license": "MIT"
     },
+    "node_modules/nodemailer": {
+      "version": "8.0.4",
+      "resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-8.0.4.tgz",
+      "integrity": "sha512-k+jf6N8PfQJ0Fe8ZhJlgqU5qJU44Lpvp2yvidH3vp1lPnVQMgi4yEEMPXg5eJS1gFIJTVq1NHBk7Ia9ARdSBdQ==",
+      "license": "MIT-0",
+      "engines": {
+        "node": ">=6.0.0"
+      }
+    },
     "node_modules/nypm": {
       "version": "0.6.5",
       "resolved": "https://registry.npmjs.org/nypm/-/nypm-0.6.5.tgz",