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

portable/setup.sh

@@ -0,0 +1,127 @@
+#!/bin/bash
+# ============================================================
+# U-Claw Portable — 开发环境搭建脚本
+# 用法: bash setup.sh
+# 作用: 下载 Node.js 运行时 + 安装 OpenClaw 到 app/ 目录
+# ============================================================
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+APP_DIR="$SCRIPT_DIR/app"
+CORE_DIR="$APP_DIR/core"
+RUNTIME_DIR="$APP_DIR/runtime"
+MIRROR="https://registry.npmmirror.com"
+NODE_MIRROR="https://npmmirror.com/mirrors/node"
+NODE_VERSION="v22.14.0"
+
+GREEN='\033[0;32m'
+CYAN='\033[0;36m'
+RED='\033[0;31m'
+NC='\033[0m'
+
+echo ""
+echo -e "${CYAN}╔══════════════════════════════════════╗${NC}"
+echo -e "${CYAN}║  🦞 U-Claw Portable Setup           ║${NC}"
+echo -e "${CYAN}╚══════════════════════════════════════╝${NC}"
+echo ""
+
+# ---- Detect OS & Arch ----
+OS=$(uname -s)
+ARCH=$(uname -m)
+
+if [ "$OS" = "Darwin" ]; then
+    if [ "$ARCH" = "arm64" ]; then
+        PLATFORM="darwin-arm64"
+        NODE_DIR_NAME="node-mac-arm64"
+    else
+        PLATFORM="darwin-x64"
+        NODE_DIR_NAME="node-mac-x64"
+    fi
+elif [ "$OS" = "Linux" ]; then
+    PLATFORM="linux-x64"
+    NODE_DIR_NAME="node-linux-x64"
+else
+    echo -e "${RED}请在 Mac 或 Linux 上运行此脚本。Windows 请用 setup.bat${NC}"
+    exit 1
+fi
+
+echo -e "  系统: ${GREEN}$OS $ARCH${NC}"
+echo ""
+
+# ---- 1. Download Node.js ----
+NODE_TARGET="$RUNTIME_DIR/$NODE_DIR_NAME"
+
+if [ -f "$NODE_TARGET/bin/node" ]; then
+    echo -e "  ${GREEN}✓${NC} Node.js 已存在，跳过下载"
+else
+    echo -e "  ${CYAN}↓${NC} 下载 Node.js $NODE_VERSION ($PLATFORM)..."
+    mkdir -p "$NODE_TARGET"
+
+    NODE_URL="$NODE_MIRROR/$NODE_VERSION/node-$NODE_VERSION-$PLATFORM.tar.gz"
+    echo "    $NODE_URL"
+
+    curl -fSL "$NODE_URL" | tar xz -C "$NODE_TARGET" --strip-components=1
+
+    if [ -f "$NODE_TARGET/bin/node" ]; then
+        echo -e "  ${GREEN}✓${NC} Node.js 下载完成"
+    else
+        echo -e "  ${RED}✗ Node.js 下载失败${NC}"
+        exit 1
+    fi
+fi
+
+# ---- 2. Install OpenClaw ----
+if [ -d "$CORE_DIR/node_modules/openclaw" ]; then
+    echo -e "  ${GREEN}✓${NC} OpenClaw 已安装，跳过"
+else
+    echo -e "  ${CYAN}↓${NC} 安装 OpenClaw..."
+    mkdir -p "$CORE_DIR"
+
+    # Init package.json if not exists
+    if [ ! -f "$CORE_DIR/package.json" ]; then
+        cat > "$CORE_DIR/package.json" << 'PKGJSON'
+{
+  "name": "u-claw-core",
+  "version": "1.0.0",
+  "private": true,
+  "dependencies": {
+    "openclaw": "latest"
+  }
+}
+PKGJSON
+    fi
+
+    # Install with China mirror
+    NODE_BIN="$NODE_TARGET/bin/node"
+    NPM_BIN="$NODE_TARGET/bin/npm"
+    "$NODE_BIN" "$NPM_BIN" install --prefix "$CORE_DIR" --registry="$MIRROR"
+
+    echo -e "  ${GREEN}✓${NC} OpenClaw 安装完成"
+fi
+
+# ---- 3. Install QQ Plugin ----
+if [ -d "$CORE_DIR/node_modules/@sliverp/qqbot" ]; then
+    echo -e "  ${GREEN}✓${NC} QQ 插件已安装，跳过"
+else
+    echo -e "  ${CYAN}↓${NC} 安装 QQ 插件..."
+    NODE_BIN="$NODE_TARGET/bin/node"
+    NPM_BIN="$NODE_TARGET/bin/npm"
+    "$NODE_BIN" "$NPM_BIN" install @sliverp/qqbot@latest --prefix "$CORE_DIR" --registry="$MIRROR" 2>/dev/null || true
+    echo -e "  ${GREEN}✓${NC} QQ 插件安装完成"
+fi
+
+# ---- Done ----
+echo ""
+echo -e "${GREEN}════════════════════════════════════════${NC}"
+echo -e "${GREEN}  ✅ 搭建完成！${NC}"
+echo ""
+echo -e "  启动方式:"
+echo -e "    Mac:     ${CYAN}bash Mac-Start.command${NC}"
+echo -e "    Windows: 双击 ${CYAN}Windows-Start.bat${NC}"
+echo ""
+echo -e "  目录结构:"
+echo -e "    app/core/       ← OpenClaw + 依赖"
+echo -e "    app/runtime/    ← Node.js $NODE_VERSION"
+echo -e "    data/           ← 运行后自动生成"
+echo -e "${GREEN}════════════════════════════════════════${NC}"