Add native C++ Qt6 GUI host application

Introduce production-grade desktop GUI for hosting Commonwealth Online servers.

Features:
- Native C++ Qt6 application with minimal dependencies
- Start/stop server buttons with live status indicator
- Real-time stats display (uptime, clients, packet counts)
- Live connected clients table
- Server log viewer with timestamps
- Fallout 4-inspired dark theme (amber/green accents)
- Subprocess management (server independent of GUI)
- Auto-detection of Python and server directory
- Professional error handling and graceful shutdown

Architecture:
- MainWindow: Qt UI components and layout
- ServerProcess: Manages Python relay subprocess
- Subprocess spawns consumer_server_cli.py
- Real-time log capture and parsing
- Qt signals/slots for UI updates

Build:
- CMake 3.20+ configuration
- Visual Studio 2022 MSVC compiler
- Qt6.4+ required
- Windows 10+ target
- build.bat script for easy compilation

Project structure:
- src/main.cpp - entry point
- src/MainWindow.h/cpp - main UI window
- src/ServerProcess.h/cpp - subprocess and IPC layer
- src/resources/ - Qt resources and icons
- CMakeLists.txt - Qt6 build config
- build.bat - Windows build script
- README.md - user guide
- DEVELOPMENT.md - developer guide

Co-authored-by: Cursor <cursoragent@cursor.com>

host-gui/build.bat

@@ -0,0 +1,59 @@
+@echo off
+setlocal enabledelayedexpansion
+
+echo.
+echo ================================================================================
+echo  Commonwealth Online - Qt GUI Build Script
+echo ================================================================================
+echo.
+
+REM Check if CMake is installed
+cmake --version >nul 2>&1
+if errorlevel 1 (
+    echo ERROR: CMake is not installed or not in PATH.
+    echo Please install CMake from https://cmake.org/download/
+    pause
+    exit /b 1
+)
+
+REM Create build directory
+if not exist "build" (
+    echo Creating build directory...
+    mkdir build
+)
+
+cd build
+
+echo Configuring Qt6 project with CMake...
+cmake .. -G "Visual Studio 17 2022" -DCMAKE_PREFIX_PATH="C:\Qt\6.4.0\msvc2019_64"
+
+if errorlevel 1 (
+    echo ERROR: CMake configuration failed.
+    echo Make sure:
+    echo   1. Qt6 is installed
+    echo   2. Visual Studio 2022 is installed
+    echo   3. CMAKE_PREFIX_PATH points to your Qt6 installation
+    pause
+    exit /b 1
+)
+
+echo.
+echo Configuration successful!
+echo.
+echo Building project...
+cmake --build . --config Release
+
+if errorlevel 1 (
+    echo ERROR: Build failed.
+    pause
+    exit /b 1
+)
+
+echo.
+echo ================================================================================
+echo  Build successful!
+echo ================================================================================
+echo.
+echo Executable: %cd%\bin\Release\CommonwealthOnlineHost.exe
+echo.
+pause