Measures controls on Settings Page

[blakenan-bellese]

Goal

Allow administrators to manage Measures, Facilities, and Date Range presets through the Admin UI.

Changes

• Replace the Admin placeholder with three CRUD management sections:
  • Measures — Add/edit/remove measure definitions available in the MCT
• Changes should persist (backend API needed) rather than being lost on reload

Note: This issue addresses the need previously described in issue #4 . Consider reviewing these two issues together to ensure we're fully addressing the need.

Key Files

• frontend/src/pages/admin/index.js — build out CRUD UI sections
• Backend — new API endpoints for managing configuration (currently all static JSON files)

Figma Reference: https://www.figma.com/design/6iECNH0Vo9dj6YEK4qdtrd/Leavitt-dQM-Testing?node-id=0-1&t=QzdmLqu9L4v4de11-1

[charliesteininger]

https://www.figma.com/design/6iECNH0Vo9dj6YEK4qdtrd/Leavitt-dQM-Testing?node-id=0-1&t=d9A3HRgPpvZlYvch-1