Option to change log format to JSON

First off, thank you for putting in the work. This is a super helpful project.

I would appreciate it if it was possible to enable an option besides LOG_WITHOUT_NEWLINE and DISABLE_REQUEST_LOGS to have one line per request in the log output formatted as JSON.

One of the reasons is that I don't use the logs on the host machine directly. They might get scraped and processed out of order by Loki, so they might not end up next to each other. The second reason is that it would be simpler to parse them when they had the same format.

首先定位现有的 LOG_WITHOUT_NEWLINE 和 DISABLE_REQUEST_LOGS 选项，并跟踪请求日志记录路径。添加一种可选择的 JSON 格式，使每个请求输出一行，然后验证输出始终可解析，并保留所请求的日志信息。