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/test/java/com/ruoyi/cms/externalimport/ExternalJobExcelParserTest.java

@@ -0,0 +1,56 @@
+package com.ruoyi.cms.externalimport;
+
+import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.ss.usermodel.CellStyle;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
+import org.junit.jupiter.api.Test;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.time.LocalDate;
+import java.util.Date;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class ExternalJobExcelParserTest {
+    @Test
+    void parsesExcelDatesAndLocationFallback() throws Exception {
+        byte[] data = workbookBytes();
+        List<ExternalJobCandidate> rows = new ExternalJobExcelParser().parse(new ByteArrayInputStream(data));
+
+        assertEquals(1, rows.size());
+        ExternalJobCandidate row = rows.get(0);
+        assertEquals("2026-07-14", row.getPostingDate());
+        assertEquals("2026-07-20", row.getCollectDate());
+        assertEquals("石河子市", row.getLocation());
+        assertEquals("Java 工程师", row.getJobTitle());
+    }
+
+    private byte[] workbookBytes() throws Exception {
+        String[] headers = {"Aca112", "Acb22a", "SalaryLow", "SalaryHight", "Aae397", "AAB004", "ORG", "ACE760", "Collect_time", "City"};
+        try (XSSFWorkbook workbook = new XSSFWorkbook(); ByteArrayOutputStream output = new ByteArrayOutputStream()) {
+            Row header = workbook.createSheet("合并数据").createRow(0);
+            for (int i = 0; i < headers.length; i++) {
+                header.createCell(i).setCellValue(headers[i]);
+            }
+            Row data = workbook.getSheetAt(0).createRow(1);
+            CellStyle dateStyle = workbook.createCellStyle();
+            dateStyle.setDataFormat(workbook.getCreationHelper().createDataFormat().getFormat("yyyy-mm-dd"));
+            data.createCell(0).setCellValue("Java 工程师");
+            data.createCell(1).setCellValue("负责平台开发");
+            data.createCell(2).setCellValue(5000);
+            data.createCell(3).setCellValue(10000);
+            data.createCell(4).setCellValue(Date.from(LocalDate.of(2026, 7, 14).atStartOfDay(java.time.ZoneId.systemDefault()).toInstant()));
+            data.getCell(4).setCellStyle(dateStyle);
+            data.createCell(5).setCellValue("示例企业");
+            data.createCell(6).setCellValue("智联招聘");
+            data.createCell(7).setCellValue("https://www.zhaopin.com/job/42");
+            data.createCell(8).setCellValue(Date.from(LocalDate.of(2026, 7, 20).atStartOfDay(java.time.ZoneId.systemDefault()).toInstant()));
+            data.getCell(8).setCellStyle(dateStyle);
+            data.createCell(9).setCellValue("石河子市");
+            workbook.write(output);
+            return output.toByteArray();
+        }
+    }
+}

ruoyi-bussiness/src/test/java/com/ruoyi/cms/externalimport/ExternalJobFingerprintTest.java

@@ -0,0 +1,42 @@
+package com.ruoyi.cms.externalimport;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+
+class ExternalJobFingerprintTest {
+    @Test
+    void identityFingerprintIgnoresTrackingParametersAndMutableContent() {
+        ExternalJobCandidate first = candidate("https://www.zhaopin.com/job/42/?utm_source=test&from=feed", "5000", "岗位描述一");
+        ExternalJobCandidate changed = candidate("https://www.zhaopin.com/job/42?utm_campaign=summer", "7000", "岗位描述二");
+
+        assertEquals(ExternalJobFingerprint.identity(first), ExternalJobFingerprint.identity(changed));
+        assertNotEquals(ExternalJobFingerprint.content(first), ExternalJobFingerprint.content(changed));
+    }
+
+    @Test
+    void identityFingerprintSeparatesDifferentSources() {
+        ExternalJobCandidate zhaopin = candidate("https://www.zhaopin.com/job/42", "5000", "岗位描述");
+        ExternalJobCandidate liepin = candidate("https://www.zhaopin.com/job/42", "5000", "岗位描述");
+        liepin.setSourceCode("liepin");
+
+        assertNotEquals(ExternalJobFingerprint.identity(zhaopin), ExternalJobFingerprint.identity(liepin));
+    }
+
+    private ExternalJobCandidate candidate(String url, String salary, String description) {
+        ExternalJobCandidate candidate = new ExternalJobCandidate();
+        candidate.setSourceCode("zhaopin");
+        candidate.setCompanyName("石河子示例企业");
+        candidate.setJobTitle("Java 工程师");
+        candidate.setLocation("石河子市");
+        candidate.setJobUrl(url);
+        candidate.setSalaryLow(salary);
+        candidate.setSalaryHigh("10000");
+        candidate.setDescription(description);
+        candidate.setEducationCode("3");
+        candidate.setExperienceCode("4");
+        candidate.setPostingDate("2026-07-20");
+        return candidate;
+    }
+}