Predict page category

Use [common webpage categorization](https://docs.webshrinker.com/v3/iab-website-categories.html#iab-categories) to classify analyzed webpages

https://www.kaggle.com/code/bpmtips/iab-classification-of-text/notebook

Start with the linked IAB category documentation and Kaggle notebook to understand the intended taxonomy and approach. The issue names no repository file, entry point, test, or completion criteria, so locate the webpage-analysis path and define how category predictions will be verified.

索引モデルが issue の本文から書いたものです。