Merge board directories from the new bitsocialnet/lists per-directory layout on the client side.
Update vendored fallback data, sync tooling, directory references, and tests.
Treat failed board stat fetches as complete on the home page so stats do not stay loading forever.
Multi-adapter boundary in normalizeDirectoriesData() supports both
communities[] and directories[] upstream schemas. Sync script mirrors
logic and writes canonical format. Preserves directoryCode and features
for future use.
Adds sync-directories.js script that fetches 5chan-directories.json from bitsocialhq/lists and updates the vendored fallback. Runs before generate:assets in prestart and prebuild to ensure the fallback is fresh for every build. Non-fatal: if fetch fails, existing file is kept.
