Add novel reader integration with LNReader JS plugin support

Full novel reading support using LNReader's JavaScript plugin ecosystem:

Core (hayai.novel.*):
- QuickJS-based JS runtime with full LNReader API bridge (fetch, cheerio,
  dayjs, storage, require)
- NovelSource implementing CatalogueSource + TextSource marker
- Plugin manager: install/uninstall/update from configurable repos
- Novel repo system with SQLDelight persistence

Reader (hayai.novel.reader.*):
- NovelViewer following WebtoonViewer architecture (RecyclerView + Adapter)
- WebView-based page rendering with themed CSS (5 themes)
- GestureDetector tap navigation with correct system inset handling
- All 6 navigation modes (L, Kindlish, Edge, RightLeft, Disabled)
- Scroll progress tracking (percentage-based) with position restoration
- Reader settings tab (font size/family, line height, alignment, padding, theme)
- Preferences wired via .register() pattern matching WebtoonConfig/PagerConfig

Integration:
- Download queue: Download.source widened to Source, novel chapters saved as HTML
- Bottom sheet: Novel plugins tab with install/update UI
- All strings via moko-resources (no hardcoded text)
- Backup compatible: novels stored as regular Manga entities

Author: ig4e