refactor(infra): directory structure (#4615)

packages/backend/server/scripts/test-send-local-mail.ts

@@ -0,0 +1,18 @@
+import { createTransport } from 'nodemailer';
+
+const transport = createTransport({
+  host: '0.0.0.0',
+  port: 1025,
+  secure: false,
+  auth: {
+    user: 'himself65',
+    pass: '123456',
+  },
+});
+
+await transport.sendMail({
+  from: 'noreply@toeverything.info',
+  to: 'himself65@outlook.com',
+  subject: 'test',
+  html: `<div>hello world</div>`,
+});