report(lab04): rewrite detailed report and generate text-first pdf

docs(lab04): add vkvideo/rutube section to release notes

docs(lab04): add vkvideo and rutube links for execution/report/presentation

build: make presentation html self-contained and refresh release artifacts

report+presentation: redesign structure and rebuild visual pdf artifacts with visible images

presentation: redesign lab04 slides with cleaner narrative structure

docs: add polished release notes for lab04

fix: generate diverse informative screenshots for all lab04 figures

style: unify lab04 formatting across README, links, report, presentation, and release

lab04: generate own screenshots and rebuild release artifacts

lab04: align structure with reference and replace images with neutral placeholders

chore: remove example directory from repository