A flagged name and its subdomains are served behind a warning that names the
reason, the list and the report transaction. The visitor may continue, per
name, for a day. The one refusal is the csam reason.
/api/blocklist returns the subscribed lists and current flags, and
/api/name/<name> carries the flag fields, for clients that cannot reach a
full electrum server. It is a convenience copy: every entry names its report
and can be re-derived from the list address.
Flags are read once a minute from full servers and shared across requests;
names are resolved without the extra round trip. BNS_BLOCKLISTS adds lists.
The mobile constants now carry the default subscriptions for the consumer to
come, and the docs explain flagged names.
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