refactor: flatten dto entity and mapper packages

src/main/java/com/label/dto/UserInfoResponse.java

@@ -0,0 +1,26 @@
+package com.label.dto;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+
+/**
+ * GET /api/auth/me 响应体，包含当前登录用户的详细信息。
+ */
+@Data
+@AllArgsConstructor
+@Schema(description = "当前登录用户信息")
+public class UserInfoResponse {
+    @Schema(description = "用户主键")
+    private Long id;
+    @Schema(description = "用户名")
+    private String username;
+    @Schema(description = "真实姓名")
+    private String realName;
+    @Schema(description = "角色", example = "ADMIN")
+    private String role;
+    @Schema(description = "所属公司 ID")
+    private Long companyId;
+    @Schema(description = "所属公司名称")
+    private String companyName;
+}