feat: restructure repo for collaboration + add desktop app source

- Reorganize project: clean structure (portable/ u-claw-app/ usb-scripts/ website/)
- Move docs into website/, rename uclaw-scripts to usb-scripts
- Add u-claw-app/ Electron desktop source code
- Add portable/setup.sh: one-command dev environment setup
- Add portable/SkillHub.html: skill marketplace page
- Update README: dev guide, contribution workflow, project structure
- Update .gitignore: exclude runtime binaries and build artifacts
- Expand China install guide: npm mirrors, detailed onboard wizard

usb-scripts/Mac-Install.command

@@ -0,0 +1,90 @@
+#!/bin/bash
+# U-Claw - Extract and Launch (macOS)
+
+GREEN='\033[0;32m'
+CYAN='\033[0;36m'
+RED='\033[0;31m'
+YELLOW='\033[1;33m'
+NC='\033[0m'
+
+clear
+echo ""
+echo -e "${CYAN}"
+echo "  ╔══════════════════════════════════════╗"
+echo "  ║     U-Claw 虾盘 v1.1                ║"
+echo "  ║     一键解压并启动 (macOS)           ║"
+echo "  ╚══════════════════════════════════════╝"
+echo -e "${NC}"
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+ARCHIVE="$SCRIPT_DIR/U-Claw.tar.gz"
+INSTALL_DIR="$SCRIPT_DIR/U-Claw"
+
+# 移除 macOS 隔离标记
+xattr -rd com.apple.quarantine "$SCRIPT_DIR" 2>/dev/null || true
+
+# 检查压缩包
+if [ ! -f "$ARCHIVE" ]; then
+    echo -e "  ${RED}错误: 找不到 U-Claw.tar.gz${NC}"
+    echo "  请确保此脚本和压缩包在同一目录"
+    read -p "  按回车键退出..."
+    exit 1
+fi
+
+# 检查是否已解压
+if [ -d "$INSTALL_DIR/app/core/node_modules" ]; then
+    echo -e "  ${GREEN}检测到已解压的 U-Claw${NC}"
+    echo "  位置: $INSTALL_DIR"
+    echo ""
+    echo -e "  ${YELLOW}[1] 直接启动（跳过解压）${NC}"
+    echo "  [2] 重新解压（覆盖现有）"
+    echo ""
+    read -p "  请选择 [1/2，默认1]: " choice
+    choice="${choice:-1}"
+    if [ "$choice" = "2" ]; then
+        echo ""
+        echo -e "  ${YELLOW}正在重新解压...${NC}"
+        rm -rf "$INSTALL_DIR"
+    else
+        echo ""
+        echo -e "  ${CYAN}跳过解压，直接启动...${NC}"
+    fi
+fi
+
+# 解压（如果需要）
+if [ ! -d "$INSTALL_DIR/app/core/node_modules" ]; then
+    echo ""
+    echo -e "  ${CYAN}正在解压 U-Claw ...${NC}"
+    echo "  解压到: $INSTALL_DIR"
+    echo ""
+
+    # 检测是否在 U 盘上（挂载点判断）
+    if echo "$SCRIPT_DIR" | grep -q "/Volumes/"; then
+        echo -e "  ${YELLOW}检测到 U 盘，解压可能需要 3-5 分钟，请耐心等待...${NC}"
+    else
+        echo "  大约需要 1-2 分钟..."
+    fi
+    echo ""
+
+    cd "$SCRIPT_DIR"
+    tar xzf "$ARCHIVE"
+
+    if [ $? -ne 0 ]; then
+        echo -e "  ${RED}解压失败！${NC}"
+        read -p "  按回车键退出..."
+        exit 1
+    fi
+
+    # 解压后移除隔离标记
+    xattr -rd com.apple.quarantine "$INSTALL_DIR" 2>/dev/null || true
+
+    echo -e "  ${GREEN}解压完成！${NC}"
+    echo ""
+fi
+
+# 启动
+echo -e "  ${CYAN}正在启动 OpenClaw...${NC}"
+echo ""
+
+cd "$INSTALL_DIR"
+exec bash "$INSTALL_DIR/Mac-Start.command"