Update dashboard overview documentation for v2 pages and realtime surfaces

[numnx]

This change updates the dashboard documentation to accurately reflect the v2 UI layout and real-time backend architecture. It adds missing routes (like Scheduler, Knowledge, and Files) to route lists, specifies the dock layout using KineticDock, corrects the useRealtimeResource hook casing, clarifies the backend real-time event flow via DashboardRealtimeService (src/services/dashboard-realtime-service.ts) and the websocket upgrade transport (src/server/dashboard-realtime-websocket-server.ts), and updates the connection URL convention from hardcoded wss://localhost to the more accurate GET /api/realtime.

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PR created automatically by Jules for task 6060458929441565947 started by @numnx

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