supabase / supabase-swift / 28677649985

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fix(realtime): send bare topic in broadcast REST body (#1065)

* fix(realtime): send bare topic in broadcast REST body

RealtimeChannelV2's REST broadcast path (httpSend and the automatic REST
fallback in broadcast) put the channel's full Phoenix topic
("realtime:foo") in the /api/broadcast payload, but the endpoint routes on
the bare sub-topic ("foo"). REST-delivered broadcasts were therefore
routed to a topic no WebSocket subscriber is listening on and silently
dropped.

Strip the "realtime:" prefix for the REST body via a subTopic accessor,
matching the deprecated V1 client. WebSocket frames keep the full topic.

Two existing tests asserted the prefixed topic and are corrected.

* refactor(realtime): compute subTopic once during channel init

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