chore: refresh gramsrv public release

deploy/migrations/0021_channel_message_saved_peer.up.sql

@@ -0,0 +1,9 @@
+-- 频道私信(monoforum):私信消息存进 channel_messages(复用 channel pts/事件/difference),
+-- 用 saved_peer 维度按订阅者分子会话。普通频道消息 saved_peer 为空,部分索引仅覆盖 monoforum 行。
+ALTER TABLE public.channel_messages
+    ADD COLUMN saved_peer_type character varying(16) DEFAULT ''::character varying NOT NULL;
+ALTER TABLE public.channel_messages
+    ADD COLUMN saved_peer_id bigint DEFAULT 0 NOT NULL;
+CREATE INDEX channel_messages_monoforum_sublist_idx ON public.channel_messages
+    USING btree (channel_id, saved_peer_id, id DESC)
+    WHERE ((saved_peer_id <> 0) AND (NOT deleted));