Browser extension: detect and subscribe to standard.site publications on ATProto substandard.blog

feat(panoptiblog): add the standard.site indexer and rankings page #496

targeting main from claude/pano-indexer
Closed opened by and assigned to martingale-palash.test.pds.did.bot
targeting main from claude/pano-indexer

Adds the standard.site indexer, the static rankings page, the first published snapshot, the launch post, and bounded-memory repository streaming. The indexer reads publications, documents, subscriptions, and recommends through public records and writes one snapshot.

Authors are attribution only. The page is static and reads the published dataset in the browser.

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