Multicategory Support for Joomla Items

Problem: Currently, Joomla items such as articles are limited to a single category, which makes it difficult to organize content that belongs to multiple contexts. While tags are sometimes used as a workaround, they do not integrate with core features such as routing, menus, and structured layouts in the same way as categories. Solution: This project introduces multi-category support by implementing a generic mapping table (#__category_item_map). It preserves backward compatibility and SEO integrity by using a "Primary Category" as the main reference for routing, workflows, and parameter inheritance. Deliverables: A new database schema, an updated backend interface for multi-category selection, frontend updates to reflect multi-category assignments in item views and category listings, model-level integration for custom fields, extended batch operations, unit tests, and documentation.