feat: improve resource metrics UI and fix disk/memory calculations

- Move resource metrics charts to dedicated Resources page
- Reduce chart sizes with better aspect ratios (160px height)
- Improve chart styling with modern colors and compact legends
- Fix CPU metrics to show decimal precision
- Fix disk calculation to only use root volume (was duplicating mounts)
- Fix memory calculation to use active memory instead of total used
- Change network display from MB/s to KB/s for better accuracy
- Fix list-services.mjs syntax error in scaffold template

Author: Shipra-Singh-Asd