Fix merge conflict resolution: remove literal conflict-marker text

Remove Google CSE from smart-search, keep DuckDuckGo + Bing only

Add /smart-search: DuckDuckGo + Bing scraping, optional Google CSE, JOY AI summary

Add OTA update support (adapted from Messenger backend)

Fix: JWT payload key is sub, not user_id

Add keep-alive session pinging (scoped, capped)

Add yt-dlp video extraction, page scraper, and speed optimizations (session reuse, parallel related-links search, caching)

Replace WebView auth backend with AI backend: summarize, smart search, related links

Add /login route to serve login.html

B24 Browser backend — wallpapers, news, JWT identification — https://huggingface.co/spaces/Brighton233j/Browser-back