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

frontend/web/src/lib/renderContent.tsx

@@ -1,19 +1,11 @@
 import type { ReactNode } from "react";
-import { parseContent, type ContentPart } from "../lib/parseContent";
+import { parseContent } from "../lib/parseContent";
 
-/** Render a message body into inline parts: plain text as-is, while
- *  `<action>` / `<narration>` become muted italic spans (Miuix `--mu-text-lo`).
- *  Whitespace is preserved by the caller's `whitespace-pre-wrap` container — the
- *  returned nodes are just the segments dropped into it in order. */
+/** Render a message body into its plain-text segments only. `<action>` /
+ *  `<narration>` blocks are NOT rendered inline here — they are peeled out by
+ *  `splitBubble` and shown as attachment notes outside the bubble. */
 export function renderContent(content: string): ReactNode[] {
-  return parseContent(content).map((part, i) => renderPart(part, i));
-}
-
-function renderPart(part: ContentPart, key: number): ReactNode {
-  if (part.type === "text") return <span key={key}>{part.text}</span>;
-  return (
-    <span key={key} className="italic text-[var(--mu-text-lo)]">
-      {part.text}
-    </span>
-  );
+  return parseContent(content)
+    .filter((part) => part.type === "text")
+    .map((part, i) => <span key={i}>{part.text}</span>);
 }