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/cron/JobCron.java

@@ -6,6 +6,7 @@ import com.ruoyi.cms.service.ICompanyService;
 import com.ruoyi.cms.service.IESJobSearchService;
 import com.ruoyi.cms.service.IJobService;
 import com.ruoyi.cms.service.IJobTitleSuggestService;
+import com.ruoyi.cms.externalimport.IExternalJobImportService;
 import com.ruoyi.common.utils.spring.SpringUtils;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
@@ -35,4 +36,12 @@ public class JobCron {
     public void rebuildJobTitleSuggest(){
         SpringUtils.getBean(IJobTitleSuggestService.class).rebuildCache();
     }
+
+    /**
+     * 外部 Excel 全量快照同步。
+     * Quartz 调用目标：jobCron.importLatestExternalSnapshot()
+     */
+    public void importLatestExternalSnapshot(){
+        SpringUtils.getBean(IExternalJobImportService.class).importLatest();
+    }
 }