feat: Initialize project structure and dependencies

Initialize the DigiID-TS project with basic tooling and configuration.

- Create package.json with project metadata and scripts.
- Configure TypeScript (tsconfig.json) for strict compilation.
- Set up ESLint and Prettier for code linting and formatting.
- Configure Vitest for unit testing and coverage.
- Add a standard Node.js .gitignore file.
- Install development dependencies (TypeScript, Vite, Vitest, ESLint, Prettier).
- Install core runtime dependency 'digibyte-message' from the original library's Git source.

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