Detector de IA em português

This site includes code derived from llm-cliche-highlighter by Simon Willison,
https://github.com/simonw/tools/blob/main/llm-cliche-highlighter.html
licensed under the Apache License, Version 2.0
(https://www.apache.org/licenses/LICENSE-2.0).

Changes: Portuguese (PT-PT and PT-BR) patterns, sentence counting, the
pattern-density percentage and the spelling check were added. The English
patterns are not used in this build.