feat: Implement external job import functionality

- Add ExternalJobSourceAliasRequest class for managing source alias requests.
- Create ExternalUploadClient to interact with external Excel upload system.
- Introduce ExternalUploadFileMetadata to represent metadata of uploaded files.
- Define IExternalJobImportService interface for external job import operations.
- Update JobDataTrendServiceImpl to support dynamic source code filtering.
- Modify PublicJobFairMapper.xml to ensure proper query handling.
- Add unit tests for ExternalJobExcelParser and ExternalJobFingerprint.
- Create script for applying external job import migrations.
- Implement SQL migration for external job import, including new tables and columns.

ruoyi-bussiness/src/main/java/com/ruoyi/cms/domain/Job.java

@@ -17,6 +17,7 @@ import io.swagger.annotations.ApiModelProperty;
 import lombok.Data;
 
 import java.math.BigDecimal;
+import java.util.Date;
 import java.util.List;
 
 /**
@@ -146,6 +147,32 @@ public class Job extends BaseEntity
     @ApiModelProperty("岗位链接")
     private String jobUrl;
 
+    @ApiModelProperty("是否外部 Excel 导入岗位（0否，1是）")
+    private String externalImportFlag;
+
+    @ApiModelProperty("外部来源稳定编码")
+    private String externalSourceCode;
+
+    @ApiModelProperty("外部 Excel 原始来源名称")
+    private String externalSourceName;
+
+    @ApiModelProperty("外部岗位身份指纹")
+    private String jobFingerprint;
+
+    @ApiModelProperty("外部岗位内容指纹")
+    private String jobContentFingerprint;
+
+    @ApiModelProperty("最近一次外部导入批次")
+    private String externalBatchId;
+
+    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
+    @ApiModelProperty("外部岗位首次出现时间")
+    private Date externalFirstSeenAt;
+
+    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
+    @ApiModelProperty("外部岗位最近出现时间")
+    private Date externalLastSeenAt;
+
     @ApiModelProperty("jobRow对应id")
     private Long rowId;