feat: improvements of awesome-copilot scaffold command, TreeView and Windows-specific handling

[wherka-ama]

Description

Enhancing scaffolding system for awesome-copilot projects and improved bundle management UI.

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 📝 Documentation update

Changes Made

• Project Scaffolding: Added scaffold command with extensible type architecture, JSON schema validation, and GitHub Actions workflow generation with customizable runner support (ubuntu-latest, self-hosted, custom)
• TreeView Improvements: Fixed bundle details loading, added right-click context menus for bundle management (view, update, uninstall), integrated marketplace webview for rich details display
• Windows Compatibility: Fixed file path handling using vscode.Uri.file() and proper path escaping in HTML onclick attributes for cross-platform file operations
• First-Run Experience: Auto-configure official Awesome Copilot source on extension activation, added reset command for testing
  Developer Experience: Enhanced scaffold with VS Code settings, YAML schema validation, js-yaml dependency, comprehensive README with complete setup instructions including npm install

Testing

Test Coverage

• Unit tests added/updated
• Integration tests added/updated
• Manual testing completed
• All existing tests pass

Manual Testing Steps

1. Install the extension
2. The official Awesome Copilot repo should be pre-configured and the Marketplace should contain the tiles corresponding to the content of the Awesome Copilot collections
3. Install a sample bundle
4. Verify if the TreeView works as expected i.e. when clicking on the the installed bundle the detail view opens in the editor and that it is possible to follow('Open') and see all the resources displayed there.
5. Initiate the scaffolding from command pallete: Ctrl+P -> Prompt Registry: Scaffold..
6. Select default options
7. Open folder with the content of a new repo as prompted
8. Inspect the README, the github workflows, collections/example.collection.yml

Tested On

• macOS

• Windows

• Linux

• VS Code Stable

• VS Code Insiders

Screenshots

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings or errors
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache License 2.0.

[wherka-ama]

I will force this one for the moment as I'm doing it solo. Next one will be reviewed fairly.