docs: reorder README sections, fix auth examples, and bump to 2.4.3

Reorder documentation into a logical learning flow: schema definition,
relationships, validations, then queries/mutations, state machines,
controllers, query scope, auth, and middlewares. Update auth examples
to use realistic Simfinity-generated names (series, deleteserie, etc.).
Add series-sample project link to Resources and Quick Start.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: Claudio Gonzalez