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

[AI:Feature-Suggestion] ## Methodology This feature was conceptualized by analyzing modern collaborative tools (Figma, Notion, Google Docs) and identifying the gap in real-time collaboration for survey creation. The idea emerged from recognizing that survey design often involves multiple stakeholders (marketing, UX, data analysts) who need to collaborate efficiently. Current survey tools lack the seamless collaboration features that modern teams expect. ## Specification ### Problem/Opportunity Survey creation in organizations typically involves multiple stakeholders but most survey tools force sequential collaboration through comments or email. This leads to: - Inefficient feedback loops and delayed iterations - Version control issues when multiple people make changes - Lack of real-time visibility into survey development progress - Difficulty in gathering consensus on question wording and structure ### Proposed Solution A real-time collaborative survey builder that allows multiple