feat: separate db models from server

packages/models/user.js

@@ -0,0 +1,25 @@
+import { model } from 'mongoose'
+
+const User = model('User', {
+  username: {
+    type: String,
+    unique: true,
+    required: true,
+  },
+  email: {
+    type: String,
+    unique: true,
+    required: true,
+  },
+  hashedPassword: String,
+  google: {
+    id: String,
+    displayName: String,
+  },
+  github: {
+    id: String,
+    displayName: String,
+  },
+})
+
+export default User