fix: Windows support & cross-platform architecture

Major fixes for Windows portable version:

1. **Fixed critical bugs:**
   - Replace Unix /dev/null with Windows nul in all .bat files
   - Unified config path to data/.openclaw/openclaw.json
   - Fixed cross-platform node_modules compatibility issue

2. **Implemented separated core directories:**
   - app/core-mac/ for Mac dependencies
   - app/core-win/ for Windows dependencies
   - Prevents cross-platform file system conflicts
   - Shared data/ directory for configs and memory

3. **Enhanced setup.sh:**
   - Now downloads both Mac and Windows Node.js runtimes
   - Ensures U-Claw works on both platforms after setup

4. **Added diagnostic tools:**
   - Windows-Diagnose.bat for troubleshooting
   - Mac-Diagnose.command for troubleshooting
   - Auto-generates diagnostic-log.txt

5. **Improved user experience:**
   - Added Welcome.html - Simple 3-step guide in Chinese
   - All scripts updated to use platform-specific core directories
   - Better error messages and user guidance

Files modified:
- portable/Windows-Start.bat: Use core-win, fix syntax
- portable/Windows-Menu.bat: Use core-win, fix syntax
- portable/Mac-Start.command: Use core-mac
- portable/Mac-Menu.command: Use core-mac
- portable/setup.sh: Download both platforms, use core-mac

Files added:
- portable/Windows-Diagnose.bat: Diagnostic tool
- portable/Mac-Diagnose.command: Diagnostic tool
- portable/Welcome.html: User-friendly welcome page

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

portable/Mac-Diagnose.command

@@ -0,0 +1,136 @@
+#!/bin/bash
+# ============================================================
+# U-Claw Diagnostic Tool - macOS
+# 诊断工具
+# ============================================================
+
+UCLAW_DIR="$(cd "$(dirname "$0")" && pwd)"
+LOG_FILE="$UCLAW_DIR/diagnostic-log.txt"
+
+GREEN='\033[0;32m'
+RED='\033[0;31m'
+YELLOW='\033[1;33m'
+NC='\033[0m'
+
+clear
+echo ""
+echo "  ========================================"
+echo "    U-Claw Diagnostic Tool"
+echo "    诊断工具"
+echo "  ========================================"
+echo ""
+echo "  Checking system... 正在检查系统..."
+echo ""
+
+# Clear old log
+cat > "$LOG_FILE" << EOF
+U-Claw Diagnostic Report
+Generated: $(date)
+========================================
+
+EOF
+
+# 1. Check Node.js
+echo "[1/6] Checking Node.js runtime..."
+ARCH=$(uname -m)
+if [ "$ARCH" = "arm64" ]; then
+    NODE_BIN="$UCLAW_DIR/app/runtime/node-mac-arm64/bin/node"
+else
+    NODE_BIN="$UCLAW_DIR/app/runtime/node-mac-x64/bin/node"
+fi
+
+if [ -f "$NODE_BIN" ]; then
+    echo "  [OK] Node.js found" >> "$LOG_FILE"
+    echo "      Version: $($NODE_BIN --version)" >> "$LOG_FILE"
+    echo -e "  ${GREEN}✓${NC} Node.js: Found"
+else
+    echo "  [ERROR] Node.js not found" >> "$LOG_FILE"
+    echo "      Path: $NODE_BIN" >> "$LOG_FILE"
+    echo -e "  ${RED}✗${NC} Node.js: NOT FOUND"
+fi
+
+# 2. Check core-mac directory
+echo "[2/6] Checking core-mac directory..."
+CORE_DIR="$UCLAW_DIR/app/core-mac"
+if [ -d "$CORE_DIR" ]; then
+    echo "  [OK] core-mac directory exists" >> "$LOG_FILE"
+    echo -e "  ${GREEN}✓${NC} core-mac: Found"
+else
+    echo "  [ERROR] core-mac directory not found" >> "$LOG_FILE"
+    echo -e "  ${RED}✗${NC} core-mac: NOT FOUND"
+fi
+
+# 3. Check node_modules
+echo "[3/6] Checking dependencies..."
+if [ -d "$CORE_DIR/node_modules" ]; then
+    echo "  [OK] node_modules exists" >> "$LOG_FILE"
+    echo -e "  ${GREEN}✓${NC} Dependencies: Found"
+else
+    echo "  [ERROR] node_modules not found" >> "$LOG_FILE"
+    echo -e "  ${RED}✗${NC} Dependencies: NOT FOUND"
+fi
+
+# 4. Check OpenClaw
+echo "[4/6] Checking OpenClaw..."
+OPENCLAW_MJS="$CORE_DIR/node_modules/openclaw/openclaw.mjs"
+if [ -f "$OPENCLAW_MJS" ]; then
+    echo "  [OK] openclaw.mjs found" >> "$LOG_FILE"
+    echo -e "  ${GREEN}✓${NC} OpenClaw: Found"
+else
+    echo "  [ERROR] openclaw.mjs not found" >> "$LOG_FILE"
+    echo "      Path: $OPENCLAW_MJS" >> "$LOG_FILE"
+    echo -e "  ${RED}✗${NC} OpenClaw: NOT FOUND"
+fi
+
+# 5. Check port availability
+echo "[5/6] Checking port 18789..."
+if lsof -i:18789 >/dev/null 2>&1; then
+    echo "  [WARNING] Port 18789 is in use" >> "$LOG_FILE"
+    lsof -i:18789 >> "$LOG_FILE" 2>&1
+    echo -e "  ${YELLOW}⚠${NC} Port 18789: IN USE"
+else
+    echo "  [OK] Port 18789 is available" >> "$LOG_FILE"
+    echo -e "  ${GREEN}✓${NC} Port 18789: Available"
+fi
+
+# 6. Test OpenClaw startup
+echo "[6/6] Testing OpenClaw startup..."
+echo "" >> "$LOG_FILE"
+echo "Testing OpenClaw startup:" >> "$LOG_FILE"
+echo "----------------------------------------" >> "$LOG_FILE"
+
+export OPENCLAW_HOME="$UCLAW_DIR/data"
+export OPENCLAW_STATE_DIR="$UCLAW_DIR/data/.openclaw"
+export OPENCLAW_CONFIG_PATH="$OPENCLAW_STATE_DIR/openclaw.json"
+
+if [ -f "$NODE_BIN" ] && [ -f "$OPENCLAW_MJS" ]; then
+    cd "$CORE_DIR"
+    "$NODE_BIN" "$OPENCLAW_MJS" --version >> "$LOG_FILE" 2>&1
+    if [ $? -eq 0 ]; then
+        echo -e "  ${GREEN}✓${NC} OpenClaw: Can run"
+    else
+        echo -e "  ${RED}✗${NC} OpenClaw: Failed to run"
+        echo "  [ERROR] OpenClaw failed to start" >> "$LOG_FILE"
+    fi
+else
+    echo -e "  ${RED}✗${NC} Cannot test - files missing"
+    echo "  [SKIP] Cannot test - required files missing" >> "$LOG_FILE"
+fi
+
+echo ""
+echo "" >> "$LOG_FILE"
+echo "========================================" >> "$LOG_FILE"
+echo "Diagnostic complete." >> "$LOG_FILE"
+
+echo "  ========================================"
+echo "    Diagnostic Complete"
+echo "  ========================================"
+echo ""
+echo "  Log saved to: diagnostic-log.txt"
+echo ""
+echo "  Next steps:"
+echo "  1. Check diagnostic-log.txt for details"
+echo "  2. If errors found, try running Mac-Start.command"
+echo "     to auto-install missing dependencies"
+echo ""
+read -p "  Press Enter to exit..."