fix: 完善数据中枢导入与查询链路

- 支持常见 Excel 表头、工作簿校验及数据可靠落库

- 修复大整数 ID 精度和逻辑表 SQL 解析问题

- 为查询数据节点注入结构化上下文并兼容 SQL 代码块

easyflow-api/easyflow-api-admin/src/main/java/tech/easyflow/admin/controller/datacenter/DatacenterExcelController.java

@@ -6,6 +6,7 @@ import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 import org.springframework.web.multipart.MultipartFile;
 import tech.easyflow.common.domain.Result;
@@ -32,11 +33,21 @@ public class DatacenterExcelController {
     @Resource
     private DatacenterExcelImportService excelImportService;
 
+    /**
+     * 上传并导入 Excel 工作簿。
+     *
+     * @param file Excel 工作簿
+     * @param sourceName 数据源名称，留空时使用文件名
+     * @return 导入任务及新建数据源标识
+     * @throws Exception 文件解析或数据写入失败时抛出
+     */
     @PostMapping("/import")
     @SaCheckPermission("/api/v1/datacenterSource/save")
-    public Result<DatacenterImportJob> importWorkbook(MultipartFile file) throws Exception {
+    public Result<DatacenterImportJob> importWorkbook(
+            @RequestParam("file") MultipartFile file,
+            @RequestParam(value = "sourceName", required = false) String sourceName) throws Exception {
         LoginAccount account = SaTokenUtil.getLoginAccount();
-        return Result.ok(excelImportService.importWorkbook(file, account));
+        return Result.ok(excelImportService.importWorkbook(file, sourceName, account));
     }
 
     @PostMapping("/split")