feat(crm): 添加客户编码自动生成功能

- 新增 selectMaxCustomerCode 方法查询最大客户编码
- 实现客户编码自动生成逻辑，支持纯数字和带前缀格式
- 添加正则表达式解析编码规则并递增末尾数字
- 集成编码生成功能到客户插入业务流程中

klp-crm/src/main/java/com/klp/crm/mapper/CrmCustomerMapper.java

@@ -12,4 +12,9 @@ import com.klp.common.core.mapper.BaseMapperPlus;
  */
 public interface CrmCustomerMapper extends BaseMapperPlus<CrmCustomerMapper, CrmCustomer, CrmCustomerVo> {
 
+    /**
+     * 查询当前最大的customer_code，用于自动生成新编码
+     */
+    String selectMaxCustomerCode();
+
 }

klp-crm/src/main/java/com/klp/crm/service/impl/CrmCustomerServiceImpl.java

@@ -91,6 +91,25 @@ public class CrmCustomerServiceImpl implements ICrmCustomerService {
     @Override
     public Boolean insertByBo(CrmCustomerBo bo) {
         CrmCustomer add = BeanUtil.toBean(bo, CrmCustomer.class);
+        // 自动生成customer_code：查询最大编码并加1
+        if (StringUtils.isBlank(add.getCustomerCode())) {
+            String maxCode = baseMapper.selectMaxCustomerCode();
+            if (StringUtils.isBlank(maxCode)) {
+                add.setCustomerCode("00001");
+            } else {
+                // 提取末尾数字后缀并递增，支持纯数字("00001")和带前缀("KH00001")两种格式
+                java.util.regex.Pattern pattern = java.util.regex.Pattern.compile("^(.*?)(\\d+)$");
+                java.util.regex.Matcher matcher = pattern.matcher(maxCode);
+                if (matcher.matches()) {
+                    String prefix = matcher.group(1);
+                    String numStr = matcher.group(2);
+                    long num = Long.parseLong(numStr) + 1;
+                    add.setCustomerCode(prefix + String.format("%0" + numStr.length() + "d", num));
+                } else {
+                    add.setCustomerCode(maxCode + "1");
+                }
+            }
+        }
         validEntityBeforeSave(add);
         boolean flag = baseMapper.insert(add) > 0;
         if (flag) {

klp-crm/src/main/resources/mapper/CrmCustomerMapper.xml

@@ -23,5 +23,8 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
         <result property="delFlag" column="del_flag"/>
     </resultMap>
 
+    <select id="selectMaxCustomerCode" resultType="String">
+        SELECT customer_code FROM crm_customer WHERE del_flag = 0 ORDER BY LENGTH(customer_code) DESC, customer_code DESC LIMIT 1
+    </select>
 
 </mapper>