Fix the response text parsing and encoding issue when the moly and mofa agents communicate locally.

[ZhangHanDong]

The main fixes are for two issues:

1. Fix the response text parsing and encoding issue when the moly and mofa agents communicate locally.
2. If access to OpenAI or Claude is restricted in certain regions, a VPN is typically used, so communication with the local MoFA service here must bypass the proxy.

[joulei]

Hi @ZhangHanDong thanks for the PR. The proxy bypass looks good.
Also the changes or parsing seem to work and look OK, but I'll wait before merging because this change is unexpected.
Until recently the response from MoFa servers (both locally and the remote servers) was formatted differently, and in any case we were expecting a cleanup of the response. I'll ask the MoFa team about this.

[joulei]

Hi @ZhangHanDong, thanks for working this but fortunately we were able to clean up the response from the MoFa side so that all this parsing is not needed. I've merged an update here: #353
The proxy bypass is in another PR: #354
Thanks!