feat(desktop): add Electron desktop pet for Claude CLI

- Electron + React + TypeScript 桌面宠物外壳
- xterm.js + node-pty 直接对接 Claude CLI 进程
- 宠物 orb（80x80）可拖拽，点击展开终端面板
- CRT 复古终端主题（扫描线、文字发光）
- 全局快捷键 Cmd+Shift+C 显隐
- 窗口位置自动保存
- 中华田园犬吉祥物 icon（AI 生成）
- Makefile 新增 `make app` 打包命令

Makefile

@@ -3,13 +3,14 @@ VENV_MYCLAUDE := $(ROOT_DIR)/.venv/bin/myclaude
 USER_LOCAL_MYCLAUDE := $(HOME)/.local/bin/myclaude
 COMP_DIR := $(HOME)/.local/bin/completions
 
-.PHONY: help install uninstall _symlink-myclaude _install-completions _uninstall-completions
+.PHONY: help install uninstall app _symlink-myclaude _install-completions _uninstall-completions
 
 help:
 	@echo "Usage: make [target]"
 	@echo ""
 	@echo "  install     Sync venv, symlink bin, install completions"
 	@echo "  uninstall   Remove bin and completions"
+	@echo "  app         Build desktop pet as macOS .app"
 
 install:
 	@cd "$(ROOT_DIR)" && \
@@ -37,3 +38,19 @@ uninstall: _uninstall-completions
 _uninstall-completions:
 	@rm -f "$(COMP_DIR)/_myclaude" "$(COMP_DIR)/myclaude.bash"
 	@echo "Removed completions"
+
+app:
+	@cd "$(ROOT_DIR)/desktop" && \
+	if [ ! -d "node_modules" ]; then \
+		echo "Installing desktop dependencies..."; \
+		npm install; \
+	fi && \
+	echo "Rebuilding native modules for Electron..." && \
+	npx electron-rebuild && \
+	echo "Building and packaging..." && \
+	npm run pack && \
+	echo "" && \
+	echo "Done. .app bundle:" && \
+	ls -d "$(ROOT_DIR)/desktop/release"/*/*.app 2>/dev/null || \
+	ls -d "$(ROOT_DIR)/desktop/release"/*.app 2>/dev/null || \
+	echo "$(ROOT_DIR)/desktop/release/mac*/MyClaude.app"