feat(openapi): 新增对外接口模块，提供门户待办数查询接口 /openapi/countTaskforporter

新增 jeecg-system-openapi 模块，与 local-api/cloud-api 同级，作为对外能力聚合入口。
接口通过 shiro.excludeUrls 白名单放行，鉴权与业务实现完全解耦。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

jeecg-module-system/jeecg-system-start/src/main/resources/application-prod.yml

@@ -251,7 +251,7 @@ jeecg:
     #webapp文件路径
     webapp: /opt/jeecg-boot/webapp
   shiro:
-    excludeUrls: /test/jeecgDemo/demo3,/test/jeecgDemo/redisDemo/**,/bigscreen/category/**,/bigscreen/visual/**,/bigscreen/map/**,/jmreport/bigscreen2/**,/api/getUserInfo
+    excludeUrls: /test/jeecgDemo/demo3,/test/jeecgDemo/redisDemo/**,/bigscreen/category/**,/bigscreen/visual/**,/bigscreen/map/**,/jmreport/bigscreen2/**,/api/getUserInfo,/openapi/*
   #阿里云oss存储和大鱼短信秘钥配置
   oss:
     accessKey: ??