feat(admin): add optional expiry to admin IP bans (#3163)

fluxer_docs/src/content/docs/http-api/errors.md

@@ -26,8 +26,8 @@ The error code determines which supplementary members a failure has, and most co
 
 - `ip_address` is the normalised client address.
 - `appeal_email` is the address an appeal is sent to.
-- `appeals_supported` is `true` only for the permanent ban.
-- `ban_kind` is `permanent` or `temporary_24h`.
+- `appeals_supported` is `true` for both kinds of ban.
+- `ban_kind` is `permanent` or `temporary_24h`. `temporary_24h` covers every ban that records an expiry, whatever its length.
 - `expires_at` is an ISO 8601 timestamp when the ban records an expiry, and `null` otherwise, including on every permanent ban.
 
 ## Validation failure codes
@@ -462,7 +462,7 @@ Your IP address {ipAddress} has been permanently blocked from the Fluxer API by
 
 ### `GLOBAL_IP_TEMPORARILY_BANNED`
 
-Your IP address {ipAddress} has been temporarily blocked from the Fluxer API for 24 hours because of abusive or unusual access patterns
+Your IP address {ipAddress} has been temporarily blocked from the Fluxer API
 
 ### `GONE`