Merge branch 'ji' into dhk-1

Resolve column_additions_mysql.sql conflict: keep square_id columns from master and roundtable_drafts.task_id from dhk-1.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend-web/.env.example

@@ -23,7 +23,6 @@
 # VITE_NOTE_API_BASE_URL=http://47.88.25.99:8000
 # VITE_AIPI_BACKENP_URL=https://knowledgetoolserver.b.uat.4.cn
 # VITE_AIPI_FRONTEND_URL=https://knowledgetoolserver.b.uat.4.cn
-# VITE_STUDIO_ENABLED=true  # 仅控制“工作室”入口显示，列表内容仍依赖 notebook 接口数据
 
 # --- 生产打包（见 .env.production）---
 # 部署前修改 .env.production 中的地址，再执行 pnpm build