A New API (type 60) channel proxies another gateway that may host many
task plugins, so the channel setting gains task_extend_plugin_keys; the
single task_plugin_key stays valid there as well. Channel selection,
shared-model candidate rebinding, the task_plugin.bind permission gate,
plugin usage counting and the disable cascade (which now unbinds gateway
channels instead of disabling them) all honour the union of both fields,
and plugins may no longer claim channel type 60 in channelTypes.
Plugins declare meta.upstreams and the host injects ctx.upstream into
every driver hook context. On a type-60 channel the driver addresses its
own prefixed native routes (doubao, alibaba, kling, jimeng) and the host
sends the channel key as a Bearer header for every auth type; polling
threads the channel type through ChannelMeta and tasks keep the key
that submitted them. Only plugins declaring new_api can be bound.
The channel form offers an "Upstream task plugins" selector for type-60
channels, MultiSelect options can carry an icon, and the plugin API docs,
type declarations and schema describe the additive apiVersion 1
extension.
CaIon