Add dashboard workspace, sticky sessions, and UI improvements

[EremesNG]

Summary

This pull request includes significant updates and improvements:

• Dashboard Enhancements: Added a new workspace and app for the dashboard, restructured the layout using CSS Grid, and improved the Y-axis behavior in the AccountHistoryChart component.
• Sticky Sessions: Enabled persistent sticky session routing and added SPA (Single Page Application) asset serving on the server.
• Build Optimization: Transitioned the build and CI workflows to use PNPM.
• Documentation Updates: Updated README with expanded feature descriptions and usage instructions, added WCAG 2.2 accessibility guidelines, and archived design specifications for recent changes.
• API Improvements: Refined rate limiting and usage endpoint logic.

Changes Included

• Adds new dashboard workspace and app implementation.
• Updates and restructures the dashboard user interface.
• Introduces sticky session handling and optimizations.
• Improves accessibility documentation and references WCAG 2.2 standards.
• Archives recent updates and specifications for better tracking.
• Switches to PNPM for improved dependency management and CI builds.
• Fixes logical issues in the API usage endpoint.