New RSS_TYPES category with a /rss-bots page, sidebar entry, homepage tile, and an
explanation that RSS bots post a feed to a channel — share the channel link, not
the user. Remove rss from the Bots page (types table + create dropdown); the RSS
Bots page has a '+ New RSS Bot' button that only creates rss bots, with feed URL +
per hour/day/week fields shown directly (no bot-type select).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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