Decouple bundled UI from runtime API and add remote instance tooling (#1228)

Add a packaged-client runtime boundary so the shared UI can talk to local,
desktop, remote, and VS Code runtimes through the right transport instead of
assuming one same-origin web server.

Centralize OpenChamber-owned API access behind RuntimeAPIs, runtimeFetch, and
runtime URL helpers, while keeping official OpenCode traffic on the SDK path.
Support runtime switching, remote host selection, desktop client credentials,
and headless connection links for pairing packaged clients with remote
OpenChamber servers.

Harden the new auth model by moving long-lived client tokens out of browser
URLs, introducing short-lived scoped URL tokens for browser-owned transports,
restricting URL-token access to explicit readable/realtime routes, and making
client-token management session-scoped or self-scoped as appropriate.

Update browser-owned assets and preview proxy flows to work with the split
runtime model, including authenticated project icons, preview token propagation,
CSP-safe preview bridge injection, and preview proxy auth that survives
short-lived URL-token expiry.

Tighten Electron security boundaries for packaged clients by gating privileged
preload state to trusted origins and requiring explicit confirmation before
connect deep-links import or switch remote runtimes.

Also refresh agent guidance and project skills so future runtime/API, auth,
preview, UI, CLI, settings, locale, and drag-to-reorder work follows the new
architecture.

packages/docs/content/docs/ko/remote-instances.mdx

@@ -24,6 +24,18 @@ OpenChamber가 연결 확인, 원격 설정, 서버 시작, 포트 포워딩 단
 
 SSH 및 UI 비밀번호를 저장할지, 매번 입력할지 결정합니다. 연결이 끊기면 OpenChamber가 어느 단계가 실패했는지 알려주므로 고칠 수 있습니다. [Remote access](/ko/troubleshooting/remote-access/)를 참고하세요.
 
+## 직접 연결 링크
+
+원격 머신에서 OpenChamber가 이미 실행 중이면 그 머신에서 연결 링크를 만들고 **Settings → Remote Instances → Server links**에서 가져오세요:
+
+```bash
+openchamber connect-url --port 3000 --server http://your-host:3000 --qr
+```
+
+해당 포트에 서버가 없으면 `connect-url`이 먼저 서버를 시작합니다. Headless 서버에는 `--api-only`, 시작 시 LAN에 바인딩하려면 `--lan`, 브라우저 접근 보호에는 `--ui-password`, 저장된 연결 이름에는 `--name`을 사용하세요.
+
+생성된 링크에는 OpenChamber 앱용 client token이 들어 있습니다. 이 token은 브라우저 UI 비밀번호와 별개이며, 취소하거나 삭제하기 전까지 서버 재시작 후에도 유지됩니다.
+
 ## 관련 항목
 
 - [OpenCode Server](/ko/opencode-server/) — 웹이나 VS Code에서 원격 서버에 연결하세요