调整手工开票Rate校验和夜数派生

server/src/main/java/cn/nianxx/thhotel/workflows/reservation/service/impl/ReservationInvoiceGenerationServiceImpl.java

@@ -294,7 +294,7 @@ public class ReservationInvoiceGenerationServiceImpl implements ReservationInvoi
                 errors.add(prefix + "room_type: 必填字段缺失。");
             }
             validatePositive(charge.quantity(), prefix + "quantity", errors);
-            validatePositive(charge.rate(), prefix + "rate", errors);
+            validateNonNegative(charge.rate(), prefix + "rate", errors);
             validatePositive(charge.nights(), prefix + "nights", errors);
         }
     }
@@ -490,6 +490,16 @@ public class ReservationInvoiceGenerationServiceImpl implements ReservationInvoi
         }
     }
 
+    private void validateNonNegative(BigDecimal value, String fieldPath, List<String> errors) {
+        if (value == null) {
+            errors.add(fieldPath + ": 必填字段缺失。");
+            return;
+        }
+        if (value.compareTo(BigDecimal.ZERO) < 0) {
+            errors.add(fieldPath + ": 不能小于 0。");
+        }
+    }
+
     private String writeJson(Object value) {
         try {
             return objectMapper.writeValueAsString(value);