feat: restore and update installer/launcher scripts

- Restore Install-Windows.bat with npm primary + ZIP fallback for OpenCode
- Restore Install-Linux.sh with npm primary + ZIP fallback for OpenCode
- Restore Install-Mac.sh with npm primary + ZIP fallback for OpenCode
- Add Launch-Windows.bat launcher with dependency checking and port detection
- Add Launch-Unix.sh launcher for Linux/macOS
- Add Launch-Dev-Windows.bat for development mode
- All scripts use actual GitHub releases URLs for OpenCode
- Enhanced with comprehensive error handling and user guidance

Launch-Unix.sh

@@ -0,0 +1,133 @@
+#!/bin/bash
+
+echo ""
+echo "  ███╗   ██╗ ██████╗ ███╗   ███╗ █████╗ ██████╗  █████╗ ██████╗  ██████╗██╗  ██╗"
+echo "  ████╗  ██║██╔═══██╗████╗ ████║██╔══██╗██╔══██╗██╔══██╗██╔════╝██║  ██║"
+echo "  ██╔██╗ ██║██║   ██║██╔████╔██║███████║██║  ██║███████║██████╔╝██║     ███████║"
+echo "  ██║╚██╗██║██║   ██║██║╚██╔╝██║██╔══██║██║  ██║██╔══██║██╔══██╗██║     ██╔══██║"
+echo "  ██║ ╚████║╚██████╔╝██║ ╚═╝ ██║██║  ██║██████╔╝██║  ██║██║  ██║╚██████╗██║  ██║"
+echo "  ╚═╝  ╚═══╝ ╚═════╝ ╚═╝     ╚═╝╚═╝  ╚═╝╚═════╝ ╚═╝  ╚═╝╚═╝  ╚═╝ ╚═════╝╚═╝  ╚═╝"
+echo ""
+echo "  LAUNCHER - Linux/macOS"
+echo "  ═════════════════════════════════════════════════════════════════════════════"
+echo ""
+
+ERRORS=0
+WARNINGS=0
+
+cd "$(dirname "$0")"
+
+echo "[STEP 1/5] Checking Dependencies..."
+echo ""
+
+if ! command -v node &> /dev/null; then
+    echo "[ERROR] Node.js not found!"
+    echo ""
+    echo "Please install Node.js first: https://nodejs.org/"
+    echo "Then run: ./Install-Linux.sh (or ./Install-Mac.sh on macOS)"
+    echo ""
+    exit 1
+fi
+
+NODE_VERSION=$(node --version)
+echo "[OK] Node.js: $NODE_VERSION"
+
+if ! command -v npm &> /dev/null; then
+    echo "[ERROR] npm not found!"
+    echo ""
+    exit 1
+fi
+
+NPM_VERSION=$(npm --version)
+echo "[OK] npm: $NPM_VERSION"
+
+echo ""
+echo "[STEP 2/5] Checking for OpenCode CLI..."
+echo ""
+
+if command -v opencode &> /dev/null; then
+    echo "[OK] OpenCode is available in PATH"
+elif [ -f "bin/opencode" ]; then
+    echo "[OK] OpenCode binary found in bin/ folder"
+else
+    echo "[WARN] OpenCode CLI not found"
+    echo "[INFO] Run ./Install-Linux.sh (or ./Install-Mac.sh on macOS) to install OpenCode"
+    WARNINGS=$((WARNINGS + 1))
+fi
+
+echo ""
+echo "[STEP 3/5] Checking for Existing Build..."
+echo ""
+
+if [ -d "packages/ui/dist" ]; then
+    echo "[OK] UI build found"
+else
+    echo "[WARN] No UI build found. Building now..."
+    echo ""
+    cd packages/ui
+    npm run build
+    if [ $? -ne 0 ]; then
+        echo "[ERROR] UI build failed!"
+        ERRORS=$((ERRORS + 1))
+    else
+        echo "[OK] UI build completed"
+    fi
+    cd ../..
+fi
+
+echo ""
+echo "[STEP 4/5] Checking Port Availability..."
+echo ""
+
+SERVER_PORT=3001
+UI_PORT=3000
+
+if lsof -Pi :$SERVER_PORT -sTCP:LISTEN -t >/dev/null 2>&1; then
+    echo "[WARN] Port $SERVER_PORT is already in use"
+    echo "[INFO] Another NomadArch instance or app may be running"
+    echo "[INFO] To find the process: lsof -i :$SERVER_PORT"
+    echo "[INFO] To kill it: kill -9 \$(lsof -t -i:$SERVER_PORT)"
+    WARNINGS=$((WARNINGS + 1))
+else
+    echo "[OK] Port $SERVER_PORT is available"
+fi
+
+if lsof -Pi :$UI_PORT -sTCP:LISTEN -t >/dev/null 2>&1; then
+    echo "[WARN] Port $UI_PORT is already in use"
+    echo "[INFO] To find the process: lsof -i :$UI_PORT"
+    echo "[INFO] To kill it: kill -9 \$(lsof -t -i:$UI_PORT)"
+    WARNINGS=$((WARNINGS + 1))
+else
+    echo "[OK] Port $UI_PORT is available"
+fi
+
+echo ""
+echo "[STEP 5/5] Starting NomadArch..."
+echo ""
+
+if [ $ERRORS -gt 0 ]; then
+    echo "[ERROR] Cannot start due to errors!"
+    echo ""
+    exit 1
+fi
+
+echo "[INFO] Starting NomadArch..."
+echo "[INFO] Server will run on http://localhost:$SERVER_PORT"
+echo "[INFO] Press Ctrl+C to stop"
+echo ""
+
+npm run dev:electron
+
+if [ $? -ne 0 ]; then
+    echo ""
+    echo "[ERROR] NomadArch exited with an error!"
+    echo ""
+    echo "Common solutions:"
+    echo "  1. Check that all dependencies are installed: npm install"
+    echo "  2. Check that the UI is built: cd packages/ui && npm run build"
+    echo "  3. Check for port conflicts (see warnings above)"
+    echo "  4. Check the error message above for details"
+    echo ""
+    echo "To reinstall everything: ./Install-Linux.sh (or ./Install-Mac.sh on macOS)"
+    echo ""
+fi