Analyze promotion/review materials (述职/晋升材料) as an evaluator, identify issues and likely interview questions, then provide coaching advice. Supports text files, PDFs, and images (screenshots). Default output is Markdown file; HTML with Cloudflare R2 upload is optional. Use when user sends promotion documents, review materials, 述职材料, 晋升材料, or asks to review/analyze career advancement documents.