Enhance CLI with new commands, templates, and testing features

[Josephat-S]

This pull request introduces significant improvements to the Opusify CLI project, focusing on automated testing, package publishing, dependency management, and project documentation. The most important changes are the addition of comprehensive template integration tests, a publish workflow for npm, verbose and dynamic dependency injection, and enhanced project metadata and documentation.

Continuous Integration & Testing:

• Added a GitHub Actions workflow (.github/workflows/templates.yml) to automatically test all template combinations (template, architecture, design, sidebar) on pull requests, ensuring new changes do not break template generation.
• Introduced two new scripts, scripts/test-templates.js and scripts/test-single-template.js, to generate and build all template variants, catching regressions before release. These scripts are integrated into the CI pipeline. [1] [2]

Publishing & Distribution:

• Added a GitHub Actions workflow (.github/workflows/publish.yml) to automate publishing the package to npm on pushes to main or new tags, streamlining the release process.
• Updated .npmignore to exclude development files, test outputs, and unnecessary configs from the published npm package, reducing package size and exposure of non-essential files.

Dependency Management & CLI Improvements:

• Enhanced src/dependencies.js and src/generate.js to support verbose logging and dynamic dependency injection based on template configuration (design system, sidebar, architecture), with clear CLI output for added dependencies. [1] [2] [3] [4] [5]
• Added a new src/commands/add.js command that allows users to add plugins (like authentication, dark mode, analytics) to existing Opusify projects, updating files and dependencies as needed.

Project Metadata & Documentation:

• Improved package.json with a detailed description, keywords, author, license, Node.js engine requirement, and updated the files field to control what is published. [1] [2]
• Added a LICENSE file with the MIT license and a CODE_OF_CONDUCT.md for community standards, improving project transparency and contributor guidance. [1] [2]