feat: sync monoforum and collectible emoji status

Sync telesrv bd15657 (feat(account): implement collectible emoji status).

Skipped telesrv docs changes per public sync rules.

internal/store/memory/channel_message_history.go

@@ -24,12 +24,18 @@ func (s *ChannelStore) ListChannelHistory(_ context.Context, viewerUserID int64,
 	// 静态过滤（不含 offset 锚点的方向条件），结果保持 id 降序。
 	query := strings.ToLower(strings.TrimSpace(filter.Query))
 	matched := make([]domain.ChannelMessage, 0, len(items))
+	monoforumUserView := channel.Monoforum && !isChannelAdmin(member)
 	for _, msg := range items {
 		if msg.Deleted {
 			continue
 		}
-		if channel.Monoforum && msg.SavedPeer.ID != 0 {
-			continue
+		if channel.Monoforum {
+			if monoforumUserView && msg.SavedPeer != (domain.Peer{Type: domain.PeerTypeUser, ID: viewerUserID}) {
+				continue
+			}
+			if !monoforumUserView && msg.SavedPeer.ID != 0 {
+				continue
+			}
 		}
 		if msg.ID <= member.AvailableMinID {
 			continue