feat(ui): add support for Lidarr, Readarr, and Whisparr

[drondeseries]

This PR updates the frontend UI to support the newly added ARR applications (Lidarr, Readarr, and Whisparr).

Changes:

• ARR Configuration: The settings page now supports all 5 ARR types dynamically.
• Instance Management: Users can now add, edit, and test Lidarr, Readarr, and Whisparr instances.
• Dynamic Styling: Instance cards now use distinct colors based on the application type.
• Generic Terminology: Replaced hardcoded 'Radarr/Sonarr' mentions with 'ARR applications' throughout the UI.
• Improved Validation: Updated configuration validation to account for all configured instances.