Add Trending Paper GitHub Pages frontend

[Happy (huangyangyu)]

What changed

• adds a standalone docs/trending-paper/ GitHub Pages frontend
• preserves Weekly/Daily browsing, search, Hugging Face vote sorting, themes, responsive cards, and the Reel/PDF/QA viewer
• reads published editions from the standalone ResearchStudio API at https://researchstudio.site/daily-paper/api
• keeps the public Pages build free of the internal Triple-D regeneration and version-history controls
• includes versioned static asset URLs to avoid stale Pages caches

Why

Trending Paper should live alongside the existing Idea and Reel project pages at:

https://microsoft.github.io/ResearchStudio/trending-paper/

The ResearchStudio server remains responsible for scanning, generation, storage, APIs, and Reel artifacts; GitHub Pages is only the presentation layer.

Validation

• Weekly W32 renders all 30 published papers
• Daily mode, date navigation, search, and ascending/descending vote sorting verified
• Reel and Paper direct-link restoration verified
• Reel, PDF, and Ask a question URLs verified
• desktop and mobile responsive layouts verified
• Light/Dark themes verified
• no Debug/Regenerate/Version-history UI or endpoint strings in the public build
• browser console clean
• HTML parse and git diff --check pass

The corresponding API CORS and Reel iframe CSP allowlist were deployed separately to the standalone HF Daily web service; no Portal or generation-worker restart is required.