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-Windows.bat

@@ -0,0 +1,148 @@
+@echo off
+title NomadArch Launcher
+color 0A
+setlocal enabledelayedexpansion
+
+echo.
+echo  ███╗   ██╗ ██████╗ ███╗   ███╗ █████╗ ██████╗  █████╗ ██████╗  ██████╗██╗  ██╗
+echo  ████╗  ██║██╔═══██╗████╗ ████║██╔══██╗██╔══██╗██╔══██╗██╔════╝██║  ██║
+echo  ██╔██╗ ██║██║   ██║██╔████╔██║███████║██║  ██║███████║██████╔╝██║     ███████║
+echo  ██║╚██╗██║██║   ██║██║╚██╔╝██║██╔══██║██║  ██║██╔══██║██╔══██╗██║     ██╔══██║
+echo  ██║ ╚████║╚██████╔╝██║ ╚═╝ ██║██║  ██║██████╔╝██║  ██║██║  ██║╚██████╗██║  ██║
+echo  ╚═╝  ╚═══╝ ╚═════╝ ╚═╝     ╚═╝╚═╝  ╚═╝╚═════╝ ╚═╝  ╚═╝╚═╝  ╚═╝ ╚═════╝╚═╝  ╚═╝
+echo.
+echo  LAUNCHER - Enhanced with Auto-Fix Capabilities
+echo  ═════════════════════════════════════════════════════════════════════════════
+echo.
+
+cd /d "%~dp0"
+
+set ERRORS=0
+set WARNINGS=0
+
+echo [STEP 1/5] Checking Dependencies...
+echo.
+
+where node >nul 2>&1
+if %ERRORLEVEL% neq 0 (
+    echo [ERROR] Node.js not found!
+    echo.
+    echo Please install Node.js first: https://nodejs.org/
+    echo Then run: Install-Windows.bat
+    echo.
+    pause
+    exit /b 1
+)
+
+for /f "tokens=*" %%i in ('node --version') do set NODE_VERSION=%%i
+echo [OK] Node.js: %NODE_VERSION%
+
+where npm >nul 2>&1
+if %ERRORLEVEL% neq 0 (
+    echo [ERROR] npm not found!
+    echo.
+    pause
+    exit /b 1
+)
+
+for /f "tokens=*" %%i in ('npm --version') do set NPM_VERSION=%%i
+echo [OK] npm: %NPM_VERSION%
+
+echo.
+echo [STEP 2/5] Checking for OpenCode CLI...
+echo.
+
+where opencode >nul 2>&1
+if %ERRORLEVEL% equ 0 (
+    echo [OK] OpenCode is available in PATH
+) else (
+    if exist "bin\opencode.exe" (
+        echo [OK] OpenCode binary found in bin/ folder
+    ) else (
+        echo [WARN] OpenCode CLI not found
+        echo [INFO] Run Install-Windows.bat to install OpenCode
+        set /a WARNINGS+=1
+    )
+)
+
+echo.
+echo [STEP 3/5] Checking for Existing Build...
+echo.
+
+if exist "packages\ui\dist" (
+    echo [OK] UI build found
+) else (
+    echo [WARN] No UI build found. Building now...
+    echo.
+    cd packages\ui
+    call npm run build
+    if %ERRORLEVEL% neq 0 (
+        echo [ERROR] UI build failed!
+        set /a ERRORS+=1
+    ) else (
+        echo [OK] UI build completed
+    )
+    cd ..\..
+)
+
+echo.
+echo [STEP 4/5] Checking Port Availability...
+echo.
+
+set SERVER_PORT=3001
+set UI_PORT=3000
+
+netstat -ano | findstr ":%SERVER_PORT%" | findstr "LISTENING" >nul 2>&1
+if %ERRORLEVEL% equ 0 (
+    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: netstat -ano | findstr ":%SERVER_PORT%"
+    echo [INFO] To kill it: taskkill /F /PID <PID>
+    set /a WARNINGS+=1
+) else (
+    echo [OK] Port %SERVER_PORT% is available
+)
+
+netstat -ano | findstr ":%UI_PORT%" | findstr "LISTENING" >nul 2>&1
+if %ERRORLEVEL% equ 0 (
+    echo [WARN] Port %UI_PORT% is already in use
+    echo [INFO] To find the process: netstat -ano | findstr ":%UI_PORT%"
+    echo [INFO] To kill it: taskkill /F /PID <PID>
+    set /a WARNINGS+=1
+) else (
+    echo [OK] Port %UI_PORT% is available
+)
+
+echo.
+echo [STEP 5/5] Starting NomadArch...
+echo.
+
+if %ERRORS% gtr 0 (
+    echo [ERROR] Cannot start due to errors!
+    echo.
+    pause
+    exit /b 1
+)
+
+echo [INFO] Starting NomadArch...
+echo [INFO] Server will run on http://localhost:%SERVER_PORT%
+echo [INFO] Press Ctrl+C to stop
+echo.
+
+call npm run dev:electron
+
+if %ERRORLEVEL% neq 0 (
+    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-Windows.bat
+    echo.
+)
+
+pause