[survey] Add real-time collaborative survey design system

[AI:Feature-Suggestion] ## Methodology This feature idea was derived through analysis of modern collaborative editing trends (Google Docs, Figma, Notion) combined with the survey industry's need for team-based survey creation. The concept addresses the gap between individual survey builders and enterprise team workflows. ## Problem/Opportunity Survey creation in enterprise environments typically involves multiple stakeholders - researchers, designers, subject matter experts, and reviewers. Current survey platforms force teams to work in isolation, leading to version conflicts, miscommunication, and inefficient approval processes. This creates bottlenecks and reduces survey quality. ## Proposed Solution Implement a real-time collaborative editing system for survey design, allowing multiple team members to simultaneously work on survey creation with live updates, role-based permissions, and integrated communication tools. ### Core Features - **Live Multi-User Editing**: WebSocket-bas