Feat/better login page (#21)

docs: complete system framework spec and screenshots

feat: beautify login page and layout, add env for assigning model device

fix: ai-end do not auto reconnect, set viewport meta for frontend (#20)

fix: ai-end do not auto reconnect, set viewport meta for frontend

fix: alarm events update wrongly for ai-end rule config (#19)

fix: alarm events update wrongly for ai-end rule config

fix: interval should be float; fix camera reconnection offline bug (#18)

fix: interval should be float; fix camera reconnection offline bug

fix: set timezone for ai-end (#17)

fix: set timezone for ai-end

fix: interval int type (#16)

fix: interval int type

Fix/cascade update (#15)

feat: add tags and labels for docker build CI

feat: add support for pulling rtsp stream (#14)

feat: add support for pulling rtsp stream

feat: fine tuning live playback experience (#13)

feat: fine tuning live playback experience

fix: set timezone & correct ffmpeg exec path (#12)