feat(security): 完善用户认证和权限管理

- 添加密码编码器，增强密码安全性
- 配置安全过滤链，实现无状态会话管理
- 更新用户详细信息获取逻辑，保留现有行为

biji-houdaun/src/main/java/com/test/bijihoudaun/service/impl/UserServiceImpl.java

@@ -36,7 +36,7 @@ public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements Us
         if (user == null) {
             throw new UsernameNotFoundException("User not found with username: " + username);
         }
-        return new org.springframework.security.core.userdetails.User(user.getUsername(), user.getPassword(), new ArrayList<>());
+        return new org.springframework.security.core.userdetails.User(user.getUsername(), user.getPassword(), new ArrayList<>()); // 账号，密码，权限
     }
 
     @Override