refactor: httpclient 4.x → 5.x 完整迁移

Maven 依赖:
- org.apache.httpcomponents:httpclient:4.5.14
- → org.apache.httpcomponents.client5:httpclient5:5.6.1

API 迁移 (14 文件):
- org.apache.http.* → org.apache.hc.client5.http.* / org.apache.hc.core5.http.*
- CloseableHttpResponse → ClassicHttpResponse
- RequestConfig timeout API: 毫秒值 → TimeUnit
- SSL: SSLSocketFactory → SSLConnectionSocketFactoryBuilder
- DefaultHttpClient (已废弃) → HttpClients.custom()

工具类迁移:
- HttpReques.java (基类)
- HttpRequesPost.java (POST)
- HttpRequesGet.java (GET)
- HttpsClientUtil.java (HTTPS)
- SSLClient.java (SSL)
- CommonUtil.java (SSL 工具)

业务 Service 迁移:
- YbHttpUtils.java (医保)
- CrossSystemSendApplyUtil.java (跨系统)
- YbEleHttpServiceImpl.java (医保电子)
- EleInvoiceServiceImpl.java (电子票据)
- ThreePartPayServiceImpl.java (三方支付)
- GfStudentListAppServiceImpl.java (学生体检)
- FoodborneAcquisitionAppServiceImpl.java (食品安全)

删除: WebClientDevWrapper.java (未使用)

验证: BUILD SUCCESS

openhis-server-new/openhis-application/pom.xml

@@ -81,8 +81,8 @@
             <scope>compile</scope>
         </dependency>
         <dependency>
-            <groupId>org.apache.httpcomponents</groupId>
-            <artifactId>httpclient</artifactId>
+            <groupId>org.apache.httpcomponents.client5</groupId>
+            <artifactId>httpclient5</artifactId>
         </dependency>
 
         <dependency>