Add Electron Desktop Support and Build System Improvements

[zh3305]

Overview

This PR introduces desktop application support for Plasio using Electron and improves the build system for better development experience.

Changes

Desktop Application Support (feat: desktop)

• Added main.js as the main entry point for Electron application
• Implemented desktop build configuration and scripts
• Updated README with desktop application usage instructions
• Integrated local fonts and icons for offline usage
• Modified index.html to support offline font loading

Build System Improvements (build)

• Reorganized gulp tasks for better structure and maintainability
• Added CSS and LESS compilation tasks
• Implemented error handling functions for improved build stability
• Updated resource copying and HTML processing tasks
• Enhanced test build and LiveReload functionality
• Optimized production build and deployment tasks

Testing

The following has been tested:

• Desktop application functionality on Windows 10
• Offline font loading and rendering
• Build system tasks and outputs
• Installer and portable versions

Documentation Updates

• Added desktop application section in README including:
  • Build instructions
  • System requirements
  • Installation guide for both installer and portable versions
  • Usage instructions

Build Outputs

• Plasio Viewer Setup 0.0.1.exe - Windows installer
• Plasio Viewer 0.0.1.exe - Portable version

System Requirements

• Windows 10 or later (64-bit)
• 4GB RAM minimum
• Graphics card with WebGL support