feat(aia): Protocol Agent MVP complete with one-click generation and Word export

- Add one-click research protocol generation with streaming output

- Implement Word document export via Pandoc integration

- Add dynamic dual-panel layout with resizable split pane

- Implement collapsible content for StatePanel stages

- Add conversation history management with title auto-update

- Fix scroll behavior, markdown rendering, and UI layout issues

- Simplify conversation creation logic for reliability

extraction_service/requirements.txt

@@ -10,6 +10,7 @@ pdfplumber==0.10.3          # 备用 PDF 处理
 # Word处理
 mammoth==1.6.0              # Docx → Markdown
 python-docx==1.1.0          # Docx 读取
+pypandoc>=1.13              # Markdown → Docx (需要系统安装 pandoc)
 
 # Excel/CSV处理
 pandas>=2.0.0               # 表格处理