fix: 补全 FileRecord 实体和 Mapper（JdCloudStorageService 依赖）

cfc-backend/src/main/java/com/etotem/cfc/entity/FileRecord.java

@@ -0,0 +1,23 @@
+package com.etotem.cfc.entity;
+
+import com.baomidou.mybatisplus.annotation.IdType;
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
+import java.io.Serializable;
+import java.util.Date;
+
+@Data
+@TableName("file_record")
+public class FileRecord implements Serializable {
+    @TableId(type = IdType.AUTO)
+    private Long id;
+    private String hash;
+    private String url;
+    private Long fileSize;
+    private String contentType;
+    private String originalFilename;
+    private String category;
+    private Date createdAt;
+    private Date updatedAt;
+}

cfc-backend/src/main/java/com/etotem/cfc/mapper/FileRecordMapper.java

@@ -0,0 +1,9 @@
+package com.etotem.cfc.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.etotem.cfc.entity.FileRecord;
+import org.apache.ibatis.annotations.Mapper;
+
+@Mapper
+public interface FileRecordMapper extends BaseMapper<FileRecord> {
+}