🎨 修改获取当前存储策略为获取抽象类, 而不是接口

src/main/java/im/zhaojun/common/service/SystemConfigService.java

@@ -115,7 +115,7 @@ public class SystemConfigService {
         systemConfigRepository.save(systemConfig);
     }
 
-    public FileService getCurrentFileService() {
+    public AbstractFileService getCurrentFileService() {
         StorageTypeEnum storageStrategy = getCurrentStorageStrategy();
         return StorageTypeFactory.getStorageTypeService(storageStrategy);
     }