Add prettier configuration and code formatting

[Copilot]

This PR adds prettier code formatting to the project with automatic format validation in CI.

Changes Made

• Added prettier dependency - Installed prettier as a dev dependency
• Created prettier configuration - Added .prettierrc with TypeScript-friendly settings:
  • Single quotes
  • Semicolons enabled
  • 2-space indentation
  • 80 character line width
  • ES5 trailing commas
• Created .prettierignore - Excludes node_modules/, dist/, coverage reports, logs, and the cloned documentation
• Added npm scripts:
  • npm run format - Format all files
  • npm run format:check - Check if files are properly formatted
• Updated GitHub Actions workflow - Added format validation step that runs before build and tests
• Formatted all existing code - Applied prettier formatting to all TypeScript, JavaScript, JSON, YAML, and Markdown files

Validation

• ✅ All existing tests pass
• ✅ Code builds successfully
• ✅ Format validation passes
• ✅ CI workflow includes format checking

The formatting step in CI will now catch any code style issues and ensure consistent formatting across the codebase.

Fixes #13.

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