Update Flask port for HuggingFace Spaces

feat: PRISMA filter, query suggestions, table author fix, follow-up Q&A

feat: PRISMA filter, follow-up questions, rate limit retry, staggered post-pipeline calls

feat: follow-up question feature + fix duplicate export button

fix: SSL patch for PubMed, install deps, extract-table working

feat: session history, comparison table, predictive model, signature

feat: session history, predictive model, signature, rate limit fixes

feat: added prediction model

feat: selective literature review with paper checkboxes

feat: abstract viewer, papers passed through stream

feat: evidence confidence scoring with green/yellow/red badges

feat: SSE streaming pipeline, progress bar, PDF export

feat: working pipeline, PDF export, progress bar, structured UI

feat: Flask web UI + README