httpx's brotlicffi backend (pinned for Discord attachment decoding) fails
on Kimi API's content-encoding: br SSE streaming responses with:
brotli: decoder process called with data when can_accept_more_data() is False
This surfaces as 'API call failed after 3 retries: Connection error'
on Windows Desktop where the Electron-packaged Python venv includes
brotlicffi (#59556). DeepSeek and Xiaomi are unaffected — only
moonshot endpoints (api.moonshot.ai, api.moonshot.cn) trigger the bug.
The fix forces Accept-Encoding: gzip so the Kimi API falls back to gzip
compression, which httpx handles reliably on all platforms. This is the
same workaround already applied in tools/skills_hub.py for sitemap
fetches and the Hermes index download.
Closes associated issues: #28043, #48428
(cherry picked from commit 9c130133b0676138858b73847d1d7c7549339484)
9a8748796d