Use when: User provides text/document and asks to check originality,
detect plagiarism, assess similarity, or rewrite high-duplicate content.
Triggers: "check plagiarism", "originality check", "similarity detection",
"改写重复内容", "降重", "查重", "原创性检测", "抄袭检查"
Input: Text content or document (txt, md, docx support via text extraction)
Output: Originality score, highlighted duplicate/similar paragraphs, paraphrasing suggestions