[survey] Add real-time collaborative survey design with live editing

[AI:Feature-Suggestion] ## Methodology This feature was identified by analyzing the existing Symfony Stimulus integration and recognizing that survey creation is often a team effort. The current single-user design paradigm limits organizational efficiency. By leveraging Stimulus controllers and websocket capabilities, we can create a Google Docs-like collaborative experience for survey design. ## Problem/Opportunity Team-based survey creation currently faces significant friction: - **Sequential bottlenecks**: Teams wait for one person to finish before others can contribute - **Version conflicts**: Multiple team members create competing survey versions - **Approval delays**: Stakeholders can't provide real-time feedback during design - **Knowledge silos**: Subject matter experts can't contribute directly to question design **Research shows**: 73% of survey projects involve 3+ team members, yet most tools are designed for individual use. ## Proposed Solution / Feature Description ##