Fix HTML-escaped tool-call args and preserve upstream token usage (stream & non-stream)#239

CJackHwang merged 2 commits intodevCJackHwang/ds2api:devfrom

codex/fix-escaping-issues-and-token-countingCJackHwang/ds2api:codex/fix-escaping-issues-and-token-countingCopy head branch name to clipboard