fix: 新增应用时自动生成编码和密钥

- 自动生成应用编码：YY + 6位序号
- 自动生成32位应用密钥

backend/ruoyi-modules/pangu-business/src/main/java/org/dromara/pangu/application/service/impl/PgApplicationServiceImpl.java

@@ -1,5 +1,6 @@
 package org.dromara.pangu.application.service.impl;
 
+import cn.hutool.core.util.IdUtil;
 import cn.hutool.core.util.StrUtil;
 import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
@@ -44,9 +45,39 @@ public class PgApplicationServiceImpl implements IPgApplicationService {
 
     @Override
     public int insert(PgApplication app) {
+        // 自动生成应用编码：YY + 6位序号
+        String appCode = generateAppCode();
+        app.setAppCode(appCode);
+        // 自动生成32位应用密钥
+        app.setAppSecret(IdUtil.fastSimpleUUID());
         return baseMapper.insert(app);
     }
 
+    /**
+     * 生成应用编码
+     */
+    private String generateAppCode() {
+        // 查询当前最大编码
+        LambdaQueryWrapper<PgApplication> lqw = new LambdaQueryWrapper<>();
+        lqw.select(PgApplication::getAppCode);
+        lqw.likeRight(PgApplication::getAppCode, "YY");
+        lqw.orderByDesc(PgApplication::getAppCode);
+        lqw.last("LIMIT 1");
+        PgApplication lastApp = baseMapper.selectOne(lqw);
+        
+        int nextNum = 1;
+        if (lastApp != null && StrUtil.isNotBlank(lastApp.getAppCode())) {
+            String lastCode = lastApp.getAppCode();
+            if (lastCode.length() > 2) {
+                try {
+                    nextNum = Integer.parseInt(lastCode.substring(2)) + 1;
+                } catch (NumberFormatException ignored) {
+                }
+            }
+        }
+        return String.format("YY%06d", nextNum);
+    }
+
     @Override
     public int update(PgApplication app) {
         return baseMapper.updateById(app);