fix(preview): refine page slice breaking and height calculation for multi-page resumes

feat(export): switch resume export/import from PDF to DOCX

feat(ai): add StreamCleaner to clean suggestions output and improve prompt instructions

Fix resume design customization edits not applying and implement auto-save

fix: implement rapid failover circuit-breaker routing and OpenRouter streaming fallback to make AI suggestions instant and robust

fix: update Grok and OpenRouter model targets and set max_tokens to prevent 402/payment limit errors

fix: resolve PDF left-clipping issue in html2canvas capture

Update OpenRouter free model

Initial commit with LFS enabled