rss feed cleaner
  GET /clean?url=<feed>&token=<token>[&clean=&summarize=&filter=&fulltext=&summary=&refresh=]
  GET /feeds/<slug>?token=<token>[&clean=&summarize=&filter=&fulltext=&summary=&refresh=]
  GET /t/<token>/feeds/<slug>                                  (Reeder-safe token-in-path URL)
  GET /feeds/<slug>/status?token=<token>
  GET /feeds/<slug>/preview?token=<token>
  POST /admin/feeds/<slug>/(refresh|purge|reprocess)?token=<token>
  POST /admin/maintenance/run?token=<token>
  GET /feeds?token=<token>
  GET /feeds/digest?token=<token>                              (daily roundup of digest:true feeds)
  GET /audio/<id>.mp3?token=<token>                            (on-demand narration; referenced by feed enclosures when a feed sets audio:true)