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Please see attached file. On image file i make one prototype of list with products.
One page with form for add product from link or fill manual fields.
When user add link and click processing, automatic with php scritps read page and take values for fields.
After fields filed and press button add, products add after black line. No refresh page with post data. All action use ajax and jquery with minimalistic work on server side.
add category with button in bottom of page. also category can move with drag-drop. No have sub-categories, only main categories. With drag and drop user can make ordering.
With drag and drop user can make ordination of products in each category.
Image of each product is thumb for original image and save on the server. Image and title of products is link to url, open in new window.