增加邮箱，用户名，密码验证

src/main/java/co/jp/app/dto/LoginDto.java

@@ -1,9 +1,17 @@
 package co.jp.app.dto;
 
+import jakarta.validation.constraints.Email;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+
 public class LoginDto {
 
+    @NotBlank(message = "邮箱不能为空")
+    @Email(message = "邮箱格式不正确，请输入有效的邮箱地址")
     private String email;
 
+    @NotBlank(message = "密码不能为空")
+    @Size(min = 6, max = 30, message = "密码长度必须在6到30位之间")
     private String password;
 
     public String getEmail() {