Add Search option to Products page; Add Internal Name to Products page as a viewing option

🔍 Problem Statement
As an admin, I experience the Products page having no search functionality and not displaying the Internal Name field, which makes it time-consuming to find specific products in large catalogs.

💡 User Story
As an admin, I want to search products by title or Internal Name and see the Internal Name as a column on the Products page, so that I can quickly locate products without scrolling through a long list.

🎯 Definition of Done
- Given the Products page search, when typing a title or Internal Name, then matching products are returned instantly.
- Given the Products list, when viewed, then an Internal Name column is visible (optionally toggleable).
- This change impacts the UI (Products page search and column configuration).
- Limitations: Internal Name column is read-only; search is case-insensitive.