fix: 修复 spacing.getLine() 返回类型转换

backend/parse-service/src/main/java/com/lingyue/parse/service/WordStructuredExtractionService.java

@@ -373,7 +373,7 @@ public class WordStructuredExtractionService {
                     }
                     // 精确行距值（twips）
                     if (spacing.getLine() != null) {
-                        style.put("lineSpacingValue", spacing.getLine().intValue());
+                        style.put("lineSpacingValue", ((java.math.BigInteger) spacing.getLine()).intValue());
                     }
                 }
             } catch (Exception e) {