Convert registration to async

Sources/App/Model/User.swift

@@ -63,11 +63,12 @@ final class User: Model {
     init() { }
 
     /// Creates a new user.
-    init(id: UUID? = nil, name: String, hash: String) {
+    init(id: UUID? = nil, name: String, hash: String, email: String? = nil) {
         self.id = id
         self.name = name
         self.passwordHash = hash
         self.points = 0
+        self.recoveryEmail = email
     }
 }