补齐操作日志导出端点（adjustment/export占位）

src/CncWebApi/Controllers/LogController.cs

@@ -51,5 +51,17 @@ namespace CncWebApi.Controllers
             var result = _adjustmentRepository.GetList(targetTable, startDate, endDate, keyword, page, pageSize);
             return Ok(ApiResponse<PagedResult<CncModels.Entity.ProductionAdjustment>>.Success(result));
         }
+
+        /// <summary>
+        /// 导出修正日志（占位，暂返回提示）
+        /// GET /api/admin/log/adjustment/export
+        /// </summary>
+        [HttpGet]
+        [Route("adjustment/export")]
+        public IHttpActionResult ExportAdjustment(string targetTable = null, DateTime? startDate = null, DateTime? endDate = null, string keyword = null)
+        {
+            // 导出功能暂不实现，返回提示
+            return Ok(ApiResponse<object>.Fail(40001, "导出功能尚未实现"));
+        }
     }
 }