Add helper text for Watson classification types

[jeffpaul]

Is your enhancement related to a problem? Please describe.

Add inline helper text and tooltips to the Category, Keyword, Concept, and Entity classification fields when Watson is selected as the provider. These helper texts should explain each content type in plain language and include links to the relevant sections of IBM’s documentation to help users understand what types of terms are generated and how to best use them in WordPress. The differences between these various content types is a frequent question when doing demos of ClassifAI and hopefully adding some helper text will allow folks to self-serve in identifying the answers here.

Designs

Category ℹ️

IBM Watson analyzes your content and assigns a broad topic hierarchy that best describes the overall subject. Example: /technology and computing/software Categories are useful for general classification and site-wide content grouping. Learn more.

Keyword ℹ️

Keywords represent important terms in your content that are contextually significant. Watson extracts these to help identify core concepts, topics, and SEO-friendly tags. Keywords often map well to WordPress tags. Learn more.

Entity ℹ️

Entities are named people, places, brands, and other proper nouns mentioned in your content. Watson identifies and classifies these by type (e.g., Person, Company, Location) and optionally links them to known databases like Wikipedia. Entities are helpful for structured data and enhancing rich snippets or metadata. Learn more.

Concept ℹ️

Concepts reflect high-level abstract ideas Watson identifies in your content, even if the term isn't explicitly used. For example, an article about "the iPhone" might be linked to the concept of “Apple Inc.” Concepts are great for semantic tagging and content recommendation systems. Learn more.

Describe alternatives you've considered

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