fix(bugcollect): LogEventEntity 无 buildId，queryEvents 映射改用 null

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

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

@@ -406,7 +406,7 @@ public class LogService {
         return result.map(e -> new IssueEventResponse(
                 e.getId(), null, e.getEventId(), e.getAppKey(), e.getUserId(), e.getSessionId(),
                 null, null, null, parseJsonField(e.getDevice()),
-                e.getPlatform(), e.getRelease(), e.getBuildId(), e.getEnvironment(),
+                e.getPlatform(), e.getRelease(), null, e.getEnvironment(),
                 e.getSdkName(), e.getSdkVersion(), e.getCreatedAt()
         ));
     }