feat(house): 添加租金和面积单位字段

- 为租金字段添加rentUnit单位属性
- 为月租金字段添加monthlyRentUnit单位属性
- 为面积字段添加extentUnit单位属性
- 更新实体类HouseInfo的数据结构定义

src/main/java/com/gxwebsoft/house/entity/HouseInfo.java

@@ -48,9 +48,15 @@ public class HouseInfo implements Serializable {
     @Schema(description = "租金")
     private BigDecimal rent;
 
+    @Schema(description = "租金单位")
+    private String rentUnit;
+
     @Schema(description = "月租金")
     private BigDecimal monthlyRent;
 
+    @Schema(description = "租金单位")
+    private String monthlyRentUnit;
+
     @Schema(description = "佣金")
     private BigDecimal commission;
 
@@ -60,6 +66,9 @@ public class HouseInfo implements Serializable {
     @Schema(description = "面积")
     private String extent;
 
+    @Schema(description = "面积")
+    private String extentUnit;
+
     @Schema(description = "楼层")
     private String floor;