Add Reloader interface to remove type assertions from reload path

main.go's reloadFunc reached through the server's interface fields with
concrete type assertions (srv.MessageBoard.(*mobius.FlatNews), etc.) to
trigger SIGHUP/API reloads, leaking storage implementation details past
the manager interfaces.

Storage backends now implement a one-method Reloader interface, with
compile-time assertions for FlatNews, BanFile, ThreadedNewsYAML, and
Agreement.  BanFile.Load and ThreadedNewsYAML.Load are renamed Reload
for a uniform method set, matching FlatNews's existing convention of
using Reload for the initial load as well.

main.go registers each backend in a named reloader list as it is
constructed, and reloadFunc iterates the list.  The banner reload is a
ReloaderFunc that also performs the initial load, and the Redis-backed
ban list simply registers no reloader, replacing the old type-switch
special case.

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