Isolated boards per product with product-scoped embeds

Description: As an admin managing multiple products in one account, I want to create isolated boards and feedback spaces per product and generate embeddable widgets that are scoped to a specific product, so customers only see posts, roadmaps, and changelogs relevant to that product. Problem: Today, content and embeds can mix feedback from different products, causing confusion, cross-voting, and moderation overhead. There is no reliable way to ensure an embed for Product A only surfaces Product A content across boards, roadmaps, search, and notifications. Benefit: Product-level isolation improves clarity for users, reduces noise for product teams, enables accurate per-product analytics and permissions, and supports multi-brand/whitelabel deployments without spinning up separate workspaces.