docs: emphasize desktop-only and minimal design philosophy

Author: whtiehack

README.md

@@ -2,7 +2,9 @@
 
 English | [中文](README_zh.md)
 
-An Obsidian plugin that automatically commits vault changes to git.
+A lightweight Obsidian plugin that automatically commits vault changes to git. **Desktop only**.
+
+> **Design Philosophy**: This plugin stays minimal and focused. It does one thing well: automatic git commits. No bloat, no complexity—just simple, reliable version control for your notes.
 
 ## Features
 
@@ -120,9 +122,11 @@ Folders show the highest priority status of their contents.
 ## Requirements
 
 - Obsidian 1.2.0+
-- Desktop only (git not available on mobile)
+- **Desktop only** (Windows / macOS / Linux)
 - Git installed and accessible
 
+> **Why no mobile support?** Mobile platforms lack native Git. While [isomorphic-git](https://github.com/isomorphic-git/isomorphic-git) exists, it has significant limitations: CORS restrictions requiring proxy servers, Buffer compatibility issues, and severe performance problems (large repos can take 100+ seconds or crash). We'll revisit mobile support when isomorphic-git matures.
+
 ## License
 
 MIT

README_zh.md

@@ -2,7 +2,9 @@
 
 [English](README.md) | 中文
 
-一个自动将 Obsidian 仓库变更提交到 Git 的插件。
+一个轻量级的 Obsidian 插件，自动将仓库变更提交到 Git。**仅支持桌面端**。
+
+> **设计理念**：本插件保持克制，专注核心功能。只做好一件事：自动 Git 提交。无臃肿、无复杂——为你的笔记提供简单可靠的版本控制。
 
 ## 功能
 
@@ -120,9 +122,11 @@ npm run build
 ## 系统要求
 
 - Obsidian 1.2.0+
-- 仅支持桌面端（移动端不支持 Git）
+- **仅支持桌面端**（Windows / macOS / Linux）
 - 已安装并可访问 Git
 
+> **为何不支持移动端？** 移动平台没有原生 Git。虽然有 [isomorphic-git](https://github.com/isomorphic-git/isomorphic-git)，但它存在明显限制：CORS 限制需要代理服务器、Buffer 兼容性问题、以及严重的性能问题（大型仓库可能需要 100 多秒或直接崩溃）。等 isomorphic-git 更成熟后我们会重新考虑移动端支持。
+
 ## 许可证
 
 MIT