Cms/feature/backend integration

[Ma-Kas]

Implement backend and cms connection on tag and category routes:

• Query tag and category data from backend using tanstack query
• Implement pages for creating new tag/category, and updating existing tag/category, as well as respective tanstack mutation
• Implement deletion of existing tags/categories
• Client-side form validation, as well as error handling and display for validation, query, backend, database errors
• Popup feedback notifications for relevant success, loading, and error events

Implement category cover image setting using a media library widget, connecting to cloudinary