统一将 bms_region 替换为 region，更新相关注释和文档以反映这一变化。

bms-back/bms-system/src/main/java/com/bms/price/domain/PrcZone.java

@@ -5,7 +5,7 @@ import java.util.Date;
 import com.fasterxml.jackson.annotation.JsonFormat;
 import lombok.Data;
 
-/** Zone under bms_region: prc_zone */
+/** Zone under region: prc_zone */
 @Data
 public class PrcZone implements Serializable
 {
@@ -25,6 +25,6 @@ public class PrcZone implements Serializable
     private Date updateTime;
     /** list display, not a table column */
     private Integer detailCount;
-    /** list display from bms_region */
+    /** list display from region */
     private String countryNameCn;
 }

bms-back/bms-system/src/main/java/com/bms/price/domain/PrcZoneRegion.java

@@ -4,7 +4,7 @@ import java.io.Serializable;
 import lombok.Data;
 
 /**
- * Zone country list row: bms_region + zone aggregates (not a table)
+ * Zone country list row: region + zone aggregates (not a table)
  */
 @Data
 public class PrcZoneRegion implements Serializable