feat: add Web platform function specification template
## 📋 Web Platform Template Features
### Template Structure
- **Platform-specific sections**: Web端特色功能、Web專用頁面
- **UI naming convention**: Page_*_W format for Web pages
- **Keyboard shortcuts**: Complete shortcut system section
- **Responsive design**: Desktop-first responsive specifications
- **Web API integration**: Modern Web APIs and features
- **Cross-platform mapping**: References to corresponding mobile specs
### Web-Specific Enhancements
- **Layout specifications**: Multi-pane, sidebar, toolbar layouts
- **Interaction patterns**: Mouse, keyboard, drag-and-drop operations
- **Browser compatibility**: Cross-browser testing requirements
- **Performance optimization**: Web-specific performance strategies
- **Accessibility**: WCAG compliance and keyboard navigation
- **Enterprise features**: SSO, compliance, bulk operations
### Development Guidelines
- **Frontend framework**: React/Vue/Angular recommendations
- **State management**: Web-specific state management patterns
- **Build tools**: Webpack/Vite configuration guidance
- **Testing strategy**: Browser compatibility and performance testing
- **Code organization**: Web platform development best practices
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>