docs: add architecture, development, contributing documentation and refactor readme

[lemyskaman]

Summary

This PR adds comprehensive documentation for the project:

• docs/Architecture.md — Detailed system architecture with Mermaid diagrams (system overview, data flows, sequence diagrams, type system, interrelationship map) and a 25+ term glossary
• docs/DEVELOPMENT.md — Developer standards guide covering SOLID/DRY principles, TypeScript standards, linting, Husky hooks, trunk-based Git workflow, GitHub Actions CI/CD, Docker environment, and local package installation via npm link/file:
• CONTRIBUTING.md — Contributor onboarding guide with Code of Conduct, bug/enhancement reporting, development setup, PR process, quality gates, commit conventions, testing requirements, and release process
• README.md — Fully refactored with concise overview, installation/integration guide, feature documentation with code examples, and documentation index

All documentation reflects current codebase state (Vite plugin with content pipeline, SSG pipeline, virtual module, React hooks, SEO, CLI, Docker, automated semantic-release via OIDC).

[github-actions]

🎉 This PR is included in version 2.0.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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