feat: KOOK自动获取bot身份 + action/narration剥出气泡 + 渠道配置表单回填

agent-116 KOOK token即用+自动获取:
- kook/identity.go: Connect 调 GET /user/me 拿 bot 身份(bot_id/bot_username/bot_nickname), 失败容错
- 渠道列表 enrichAccountsWithBot 附 bot 身份; base_url空用默认/receive_mode默认ws(只填token可跑)

agent-117 action/narration 剥出气泡(主人需求: 动作/旁白不进气泡,按位置上/下):
- parseContent.splitBubble(content)->{body,head,tail}: body=纯文本(去标签), head=开头/中间action/narr(气泡上), tail=结尾(气泡下)
- renderContent 只渲染text(去内联灰斜体); chat.tsx BubbleNotes 泡外 ＊动作/旁白＊ 灰斜体小字(气泡外依附), SplitChatBubble 先剥splitBubble再splitParagraphs(body), <p>/\n\n/毛玻璃/SourceLabel不破坏
- 注: 非chat mode renderContent 现在丢弃action/narr(可接受)

Channels 配置表单回填(修save后输入框空):
- openConfig 从 data.accounts[0].config 回填 token(掩码提示)/base_url/平台字段/黑白名单/限流, 不再硬清空
全仓 build/vet/test绿+前端build绿

plugins/channels/kook/webhook_test.go

@@ -262,10 +262,22 @@ func TestWebhookHandlerMethodNotAllowed(t *testing.T) {
 func TestConnectWebhookModeSkipsGateway(t *testing.T) {
 	t.Parallel()
 
-	var calls int
+	var gatewayCalls int
+	var meCalls int
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		calls++
-		kookFail(w, 1, "should not be called")
+		switch r.URL.Path {
+		case gatewayPath:
+			// Webhook and websocket are mutually exclusive: the gateway must never be
+			// dialed in webhook mode.
+			gatewayCalls++
+			kookFail(w, 1, "should not be called")
+		case userMePath:
+			// The bot-identity lookup still runs so the adapter resolves who it is.
+			meCalls++
+			kookOK(w, map[string]any{"id": "bot-1", "username": "bot", "nickname": "Bot"})
+		default:
+			http.NotFound(w, r)
+		}
 	}))
 	defer srv.Close()
 
@@ -281,8 +293,14 @@ func TestConnectWebhookModeSkipsGateway(t *testing.T) {
 	if !a.IsConnected() {
 		t.Fatal("webhook-mode Connect should mark connected")
 	}
-	if calls != 0 {
-		t.Fatalf("gateway was dialed %d time(s) in webhook mode, want 0", calls)
+	if gatewayCalls != 0 {
+		t.Fatalf("gateway was dialed %d time(s) in webhook mode, want 0", gatewayCalls)
+	}
+	if meCalls != 1 {
+		t.Fatalf("user/me was called %d time(s), want 1", meCalls)
+	}
+	if id, _, _ := a.BotIdentity(); id != "bot-1" {
+		t.Errorf("BotIdentity id = %q, want bot-1", id)
 	}
 }