FreqIAR web assets

Source: the local FreqIAR_poster/AAAI26_workshop_FreqIAR paper folder.

overview.webp: contents/figures/IAR_backdoor_framework.png, resized without cropping.
results.webp: first page of contents/figures/IAR_backdoor.pdf, rendered without cropping.

Abstract, method summary, and numerical results are taken from the corresponding LaTeX source files. Original source assets are unchanged.