feat: add Tauri desktop client for OpenMAIC

[cccczl02]

Summary

Add Tauri desktop client support for OpenMAIC, enabling cross-platform desktop application builds with native performance.

Changes

• Integrate Tauri v2 framework for desktop app packaging
• Add GitHub Actions workflow for multi-platform desktop builds (Windows, macOS, Linux)
• Configure Tauri build environment with proper permissions
• Set up auto-release workflow for tagged versions
• Add Tauri-specific build scripts (pnpm tauri:dev, pnpm tauri:build)
• Include platform-specific icons for Windows, macOS, Linux, Android, and iOS

Type of Change

• New feature (non-breaking change that adds functionality)
• CI/CD or build changes

Verification

Steps to reproduce / test

1. Run pnpm install to install dependencies
2. Run pnpm tauri:dev to start development mode
3. Run pnpm tauri:build to create production builds
4. Or use the GitHub Actions workflow for automated multi-platform builds

Evidence

• CI passes
• Multi-platform builds tested via GitHub Actions

Checklist

• My code follows the project's coding style
• I have performed a self-review of my code
• I have added/updated documentation as needed
• My changes do not introduce new warnings