fix(kook): 丢弃自我回声消息，防 bot 把自己的回复当入站用户消息

KOOK 网关会把 bot 自己发的消息又推回给 bot(author_id=bot uid)，导致 bot 把自己的
回复当成入站用户消息处理(循环/浪费token)。toUnifiedMessage 计算 senderID 后调用
isSelf(senderID) 比对 a.botID(user/me 解析出的 bot 账号 id)，命中即返回 ok=false 丢弃。
- identity.go: 新增 isSelf(并发安全,botMu)
- message.go: self-echo 丢弃 + debug 日志
- message_test.go: TestToUnified_DropsSelfEcho
验收: go build/vet/test ./... 全绿

plugins/channels/kook/identity.go

@@ -81,6 +81,19 @@ func (a *Adapter) botIdentitySnapshot() (id, username, nickname string) {
 	return a.botID, a.botUsername, a.botNickname
 }
 
+// isSelf reports whether senderID is the bot's own account id. KOOK delivers the
+// bot's own messages back over the gateway, so an inbound event whose author_id equals
+// the bot's user id is a self-echo and must be dropped — otherwise the bridge would
+// process the bot's replies as inbound user messages and loop (or burn tokens).
+func (a *Adapter) isSelf(senderID string) bool {
+	if senderID == "" {
+		return false
+	}
+	a.botMu.RLock()
+	defer a.botMu.RUnlock()
+	return a.botID != "" && senderID == a.botID
+}
+
 // BotIdentity returns the resolved bot account (id/username/nickname). The values
 // are non-sensitive (the bot's public handle and display name) so the admin panel
 // may show them.

plugins/channels/kook/message.go

@@ -82,6 +82,12 @@ func (a *Adapter) toUnifiedMessage(data json.RawMessage, frame []byte) (adapter.
 	_ = json.Unmarshal(ev.Extra, &ex)
 
 	senderID, senderName := senderOf(&ev, &ex)
+	// Self-echo: KOOK pushes the bot's own channel messages back to it via the gateway.
+	// Drop them so the bridge never treats the bot's replies as inbound user messages.
+	if a.isSelf(senderID) {
+		a.log.Debug("self message dropped (echo)", "sender_id", senderID, "channel", ev.TargetID)
+		return adapter.UnifiedMessage{}, false
+	}
 	ct, media := messageKind(ev.Type, content)
 	group := channelIsGroup(ev.ChannelType)
 

plugins/channels/kook/message_test.go

@@ -7,6 +7,21 @@ import (
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/channel/adapter"
 )
 
+func TestToUnified_DropsSelfEcho(t *testing.T) {
+	t.Parallel()
+	a := New(Config{BotToken: "x"})
+	a.setBotIdentity(botIdentity{ID: "bot-1", Username: "Cyrene", Nickname: "Cyrene"})
+	// KOOK pushes the bot's own channel message back to it; author_id == bot id.
+	data := json.RawMessage(`{
+		"channel_type":"GROUP","type":1,"target_id":"chan-1","author_id":"bot-1",
+		"content":"咦，亲爱的这是想戳人家哪里呀♪","msg_id":"m-self","msg_timestamp":1700000000000,"nonce":"",
+		"extra":{"type":1,"guild_id":"g-1","mention":[],"author":{"id":"bot-1","username":"Cyrene","nickname":"Cyrene"}}
+	}`)
+	if _, ok := a.toUnifiedMessage(data, nil); ok {
+		t.Fatal("self-echo message should be dropped (ok=false)")
+	}
+}
+
 func TestToUnified_GroupText(t *testing.T) {
 	t.Parallel()
 	a := New(Config{BotToken: "x"})