waiwai 2378f0fbe7 fix: auto-detect Vercel for chat history path ...

On Vercel, /var/task is read-only at runtime. ChatHistoryPath() now
auto-detects Vercel via IsVercel() and defaults to /tmp/chat_history.json
when no explicit DS2API_CHAT_HISTORY_PATH is set. Manual env var still
works as explicit override.

2026-05-06 11:10:14 +08:00

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