refactor(basic): 重构景区配置获取方法并优化配置管理初始化

- 在 ScenicConfigIntegrationService 中使用 fallback 机制封装景区配置获取方法
- 优化 ScenicRepository 中的 getScenicConfigManager 方法，提高代码健壮性

src/main/java/com/ycwl/basic/repository/ScenicRepository.java

@@ -24,7 +24,9 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.data.redis.core.RedisTemplate;
 import org.springframework.stereotype.Component;
 
+import java.util.Collections;
 import java.util.List;
+import java.util.Objects;
 
 @Component
 public class ScenicRepository {
@@ -332,10 +334,7 @@ public class ScenicRepository {
     public ScenicConfigManager getScenicConfigManager(Long scenicId) {
         try {
             List<ScenicConfigV2DTO> configList = scenicConfigIntegrationService.listConfigs(scenicId);
-            if (configList != null) {
-                return new ScenicConfigManager(configList);
-            }
-            return null;
+            return new ScenicConfigManager(Objects.requireNonNullElse(configList, Collections.emptyList()));
         } catch (Exception e) {
             return null;
         }