add smtp, finish redis and register(with invitation code and verification code)

Change-Id: Ie8e07fe058b9d970a00424d463ce30d4ec72086a
diff --git a/src/main/java/com/example/g8backend/service/UserServiceImpl.java b/src/main/java/com/example/g8backend/service/UserServiceImpl.java
index a382a89..567c5f3 100644
--- a/src/main/java/com/example/g8backend/service/UserServiceImpl.java
+++ b/src/main/java/com/example/g8backend/service/UserServiceImpl.java
@@ -24,11 +24,5 @@
     public User getUserByEmail(String email) { return userMapper.getUserByEmail(email);}
 
     @Override
-    public void registerUser(User user) {
-        String password = user.getPassword(); // 获取密码
-        String encodedPassword = passwordEncoder.encode(password); // 加密密码
-        user.setPassword(encodedPassword);
-        System.out.println(user.getPassword());
-        userMapper.insert(user); // 调用 UserMapper 的 insert 方法
-    }
+    public void registerUser(User user) {userMapper.insert(user);}
 }