LeadCMS/leadcms.core ? reverse-engineered prompt

Build me a lightweight headless CMS for SaaS teams that can manage website content and landing pages, with a simple way to extend it later with plugins.

I want the app to help a team quickly create and update marketing pages, manage reusable content, and support lead generation features like tracking visitors, free trial activation, and automated license or sales flows. It should run locally with Docker for the database services, use a clean .NET backend, and include a Swagger page so it is easy to explore the API while developing.

Please set it up so core features live in the main app, while special business needs can be added as separate plugins. Include the basic developer setup, secrets handling, database migrations, and tests so someone can clone it, run it, and start building on it right away. If anything needs current docs or best practices, look them up online as needed.