fix: 增加Redis配置key过期时间到7天

- 原1小时过期导致边缘服务重启后无法获取配置
- 增加到7天确保配置在边缘服务离线期间不会丢失

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/main/java/com/genersoft/iot/vmp/aiot/service/impl/AiRedisConfigServiceImpl.java

@@ -50,7 +50,7 @@ public class AiRedisConfigServiceImpl implements IAiRedisConfigService {
     @Autowired
     private IMediaServerService mediaServerService;
 
-    private static final long KEY_EXPIRE_SECONDS = 3600;
+    private static final long KEY_EXPIRE_SECONDS = 86400 * 7;  // 7天过期
 
     @Override
     public void writeRoiToRedis(AiRoi roi) {