chore: remove dead code and unused frontend modules

Refine Grounded-SAM2 tracking behavior and video frame handling

Remove SAM3 and standardize segmentation on Grounded-SAM2

Add StreamingVideoWriter (ffmpeg pipe), reuse first-frame GPT results in inference pipeline

Add granular logging for frame processing and ffmpeg

feat: Implement AsyncVideoReader for parallel video decoding

update:inference pipeline optimization

inital commit