feat: parse config from env

[ZuLiangWang]

Which issue does this PR close?

Closes #

Rationale for this change

The special character '-' is not allowed in the environment variable, so the previous reading method of the environment variable needs to be adjusted.

What changes are included in this PR?

• Import env parse lib, ref: https://github.com/caarlos0/env

Are there any user-facing changes?

The server could be started through the environment variable.

How does this change test

Local manual test.