CRITICAL FIX: Aggressively remove ALL old '/' routes + move mount to end + ensure v2 frontend is served

Add WC2026 H2H, lineups, match detail, history API endpoints + fix CSS in frontend

Fix hashtag: add relevance filter - only show articles with topic keywords in title

Add World Cup 2026 API endpoints + background refresh thread

Add persistent interactions + comments API (views/likes/comments stored on /data)

Serve clean index_v2.html frontend, remove comments, mount /static

Force hide news grids on homepage via CSS (instant, no JS delay needed)"

Restructure: new homepage layout, news tab, more sources, auto-load hashtag"

Fix root cause: remove HTML onclick attr from chips, use data-topic from FINAL6 topic field"

Fix: hashtag uses topic field (pre-split) not label, works for all languages"

Fix: split CamelCase hashtag into words before searching (BóngĐáViệtNam → Bóng đá Việt Nam)"

Override hashtag to use VN news direct search (real URLs, scrapable)"