main主干首次提交，包含用户认证模块

src/main/java/com/labelsys/backend/common/ResultCode.java

@@ -0,0 +1,19 @@
+package com.labelsys.backend.common;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@Getter
+@RequiredArgsConstructor
+public enum ResultCode {
+    SUCCESS(200, "操作成功"),
+    BAD_REQUEST(400, "请求参数错误"),
+    UNAUTHORIZED(401, "未登录或登录已过期"),
+    FORBIDDEN(403, "无权限访问"),
+    NOT_FOUND(404, "资源不存在"),
+    CONFLICT(409, "资源冲突"),
+    ERROR(500, "系统异常");
+
+    private final Integer code;
+    private final String message;
+}