Change config files into folders with a file per service

Currently configs are made as one file per target, e.g. `bigbox-v1-cm.json`, this creates 2 issues:

1. Very large config files
2. Frequent merge conflicts when two branches change a common config

To fix both of these issues a config should now be a folder with a file per service. The config service and the capability used by the config service for config loading need to be edited for this change

首先定位 config service 以及它用于加载 config 的 capability，然后跟踪 bigbox-v1-cm.json 等目标 config 文件是如何被发现和读取的。重构该加载路径，使其支持一个包含每个 service 一个文件的文件夹，并验证大型 config 和并发的 service 更改不再需要共享文件。

由索引模型根据 Issue 内容生成。