feat(emergency): 宣教推送IM消息改为独立方法sendGroupMsgArticle，不影响已有业务

- 新增 TencentCloudImUtil.sendGroupMsgArticle: From_Account生效、不覆盖businessID、fromAdmin动态判断
- 新增 TXController.sendGroupMsgArticle / IMHelloApi.sendGroupMsgArticle
- FirstAidPushServiceImpl 推送人改为当前登录用户，调用新方法

health-emergency/health-emergency-biz/src/main/java/com/renkang/emergency/service/impl/FirstAidPushServiceImpl.java

@@ -152,9 +152,10 @@ public class FirstAidPushServiceImpl implements IFirstAidPushService {
             im.setFromUserId(loginUser != null ? loginUser.getId() : "administrator");
             im.setContent(JSONObject.toJSON(sendIm).toString());
 
-            imHelloApi.sendGroupMsg(im);
-            log.info("急救宣教推送IM消息已发送: resourceId={}, title={}, orderId={}, sessionId={}, businessId=article",
-                    resourceId, resource.getTitle(), orderId, order.getSessionId());
+            imHelloApi.sendGroupMsgArticle(im);
+            log.info("急救宣教推送IM消息已发送: resourceId={}, title={}, orderId={}, sessionId={}, pushBy={}, businessId=article",
+                    resourceId, resource.getTitle(), orderId, order.getSessionId(),
+                    loginUser != null ? loginUser.getRealname() : "unknown");
         } else {
             log.warn("急救宣教推送IM消息未发送（工单无群聊sessionId）: resourceId={}, orderId={}",
                     resourceId, orderId);