fix(bugcollect): WebhookService 使用 getRelease() 替代不存在的 getAppVersion()

LogIssueEntity 无 getAppVersion()，应使用 getRelease()，
导致上次 Jenkins 构建编译失败。

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

xuqm-bugcollect-service/src/main/java/com/xuqm/bugcollect/service/WebhookService.java

@@ -77,7 +77,7 @@ public class WebhookService {
                             "count", issue.getCount(),
                             "lastSeenAt", issue.getLastSeenAt().toString(),
                             "platform", issue.getPlatform() != null ? issue.getPlatform() : "",
-                            "appVersion", issue.getAppVersion() != null ? issue.getAppVersion() : ""
+                            "appVersion", issue.getRelease() != null ? issue.getRelease() : ""
                     )
             );