Fix Kimi 403: restore User-Agent header for Kimi Coding API compatibi… #43

Job	Run time
Web UI Gates	4m 26s
Build (x86_64-pc-windows-msvc)	13m 3s
Build (x86_64-unknown-linux-gnu)	5m 14s
Build (x86_64-apple-darwin)	11m 46s
Build (aarch64-apple-darwin)	4m 4s
Publish GitHub release (tags only)	12s
Publish to public repo (tags only)	5s
	38m 50s

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