[survey] Add collaborative survey design workshop with real-time commenting

[AI:Feature-Suggestion] ## Methodology This feature emerged from recognizing that while the current codebase has strong individual form handling, there's an opportunity to leverage the existing security and session management for collaborative features that most survey platforms lack. ## Problem/Opportunity Survey creation is typically a solitary activity, but in organizations, multiple stakeholders often need to provide input on question wording, survey structure, and analysis focus. Current tools require cumbersome back-and-forth through email or separate collaboration tools. ## Proposed Solution Create a collaborative workspace where multiple team members can simultaneously design and refine surveys: - **Real-time Collaborative Editing**: Multiple users can edit survey questions simultaneously with live cursors and changes - **Contextual Commenting System**: Stakeholders can leave comments on specific questions, sections, or logic flows - **Version History & Branching**: Track a