enhance(backend): チャンネルの既読管理を削除

- 現状上手く機能していない
- パフォーマンス上の理由
- 実装するにしてももっと効率的な方法がある

packages/misskey-js/src/entities.ts

@@ -88,7 +88,6 @@ export type MeDetailed = UserDetailed & {
 	hasPendingReceivedFollowRequest: boolean;
 	hasUnreadAnnouncement: boolean;
 	hasUnreadAntenna: boolean;
-	hasUnreadChannel: boolean;
 	hasUnreadMentions: boolean;
 	hasUnreadMessagingMessage: boolean;
 	hasUnreadNotification: boolean;

packages/misskey-js/src/streaming.types.ts

@@ -28,8 +28,6 @@ export type Channels = {
 			readAllAntennas: () => void;
 			unreadAntenna: (payload: Antenna) => void;
 			readAllAnnouncements: () => void;
-			readAllChannels: () => void;
-			unreadChannel: (payload: Note['id']) => void;
 			myTokenRegenerated: () => void;
 			reversiNoInvites: () => void;
 			reversiInvited: (payload: FIXME) => void;