feat(desktop): embed BoosAPI Desktop client as a subproject

Vendor the rebranded BoosAPI Desktop client (Tauri + Vue) into metapi as
a monorepo subdirectory under desktop/. Source only — node_modules,
dist, Cargo target and the upstream .git history are excluded.

desktop/ keeps its own independent Cargo workspace (desktop/src-tauri
with crates/*); it is not part of the backend boosapi crate, so a
`cargo check` at the metapi root still compiles only the backend. Build
the desktop app from desktop/src-tauri per desktop/README.md.

Note: app icons are still placeholder assets pending the final BoosAPI
logo. The updater signing keys live outside the repo and are not
included.

desktop/website/docs/ko/index.md

@@ -0,0 +1,57 @@
+---
+layout: home
+title: "BoosApi — 오픈소스 AI 데스크톱 클라이언트 & 게이트웨이"
+titleTemplate: false
+
+head:
+  - - meta
+    - name: description
+      content: "BoosApi은 멀티 모델 채팅, Agent, MCP, ChatGPT/Cherry Studio/Kelivo 가져오기, 로컬 RAG, S3/WebDAV 백업, 내장 AI 게이트웨이를 지원하는 무료 오픈소스 AI 데스크톱 클라이언트입니다."
+
+hero:
+  name: BoosApi
+  text: "AI 데스크톱 워크스페이스"
+  tagline: "멀티 모델 채팅, Agent, MCP 도구, API 게이트웨이, 가져오기, 지식베이스, 백업을 하나의 로컬 우선 클라이언트에 통합"
+  image:
+    src: /logo.png
+    alt: BoosApi
+  actions:
+    - theme: brand
+      text: "빠른 시작"
+      link: /ko/guide/getting-started
+    - theme: alt
+      text: "다운로드"
+      link: /ko/download
+    - theme: alt
+      text: GitHub
+      link: https://github.com/BoosApi-Desktop/BoosApi
+
+features:
+  - icon: robot
+    title: "채팅 및 모델"
+    details: "OpenAI, Claude, Gemini, DeepSeek, Qwen 및 OpenAI 호환 엔드포인트를 Base URL, API Path, headers, proxy rules와 함께 연결합니다."
+  - icon: api
+    title: "제공업체 설정"
+    details: "boosapi:// provider links 및 CC Switch import로 사용자 확인 후 provider profiles를 BoosApi으로 가져옵니다."
+  - icon: thunderbolt
+    title: "AI Agent"
+    details: "모델이 controlled workflow에서 files edit, commands run, code analysis를 수행합니다."
+  - icon: edit
+    title: "콘텐츠 렌더링"
+    details: "Markdown, code highlighting, tables, task lists, LaTeX를 streaming conversation에서 렌더링합니다."
+  - icon: search
+    title: "검색 및 지식"
+    details: "Tavily, Zhipu WebSearch, Bocha 등과 cited sources, generated queries를 지원합니다."
+  - icon: cloud-server
+    title: "API 게이트웨이"
+    details: "OpenAI Chat Completions, OpenAI Responses, Claude-native, Gemini-native endpoints를 desktop app에서 노출합니다."
+  - icon: book
+    title: "데이터 가져오기 및 백업"
+    details: "ChatGPT official exports, Cherry Studio backups, Kelivo backups를 preview counts, warnings, duplicate handling과 함께 가져옵니다."
+  - icon: lock
+    title: "데스크톱 및 보안"
+    details: "app state는 ~/.boosapi/, user files는 ~/Documents/boosapi/에 저장되며 API keys는 AES-256 local master key로 보호됩니다."
+  - icon: desktop
+    title: "데스크톱 및 보안"
+    details: "app state는 ~/.boosapi/, user files는 ~/Documents/boosapi/에 저장되며 API keys는 AES-256 local master key로 보호됩니다."
+---