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

internal/services/gateway/admin_write_channel_config.go

@@ -35,6 +35,13 @@ type AdminChannelAccount struct {
 	GroupMsgPerMin int            `json:"groupMsgPerMin,omitempty"`
 	MsgPerMin      int            `json:"msgPerMin,omitempty"`
 	MaxMessages    int            `json:"maxMessages,omitempty"`
+	// BotID/BotUsername/BotNickname are the connected bot's resolved identity
+	// (kook fetches it from /api/v3/user/me on connect). They come from the live
+	// adapter, not the persisted channels.json config, and are non-sensitive (the
+	// bot's public handle/display name), so the panel may show them.
+	BotID       string `json:"botId,omitempty"`
+	BotUsername string `json:"botUsername,omitempty"`
+	BotNickname string `json:"botNickname,omitempty"`
 }
 
 // channelConfigRequest is the PUT /api/v1/admin/channels/{platform}/config body.