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fix(security): resolve parameter injection in serial port terminal

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feat: add HID-Only mode

feat: support preview updates
perf: optimize screen parameters for reading image

Merge branch 'main' of https://github.com/sipeed/NanoKVM

feat: support setting H.264 GOP

perf: merge H.264 SPS and PPS into I-frame
perf: refactor MJPEG frame detection
perf: update log timestamp to millisecond precision
perf: update script `update-nanokvm.py`
chore: bump Go to 1.23
chore: bump golang.org/x/net to v0.37.0

update libkvm.so

update CHANGELOG