Faster dashboard startup and navigation

Opening the dashboard previously fired six separate data fetches in sequence just to render the sidebar, and server startup waited on analytics tooling before serving the first request.

• Improved sidebar loading by fetching organization, plan, and profile data together in a single round-trip
• Reduced server cold-start time by deferring analytics initialization and trimming the server bundle
• Reduced the script payload on every page by loading the live-updates client only when it connects