Add Run, Log, and Unit explorers

Three new explorer pages give the table-driven workflows you live in every day their own home in the docs.

• Added Run, Log, and Unit explorer pages under Analytics, each covering columns, filters, saved views, export (CSV and JSON, visible or selected rows), metadata, and role-based permissions
• Renamed the station Operator UI page to Remote UI to avoid confusion with the framework's per-phase operator UI components
• Rewrote the docs landing around the actual journey: build, deploy, operate, observe, collaborate, integrate, then explore
• Added a "Get support" section on the landing with direct links to Discord, support email, trainings, and custom integrations