04-Mar-2026 — add environment management section with monitoring and sorting ref #172

build 510 — commit 4479ebb

• Add column sorting to environments monitoring table with clickable headers
• Create environment management landing page with action buttons
• Add nested routes under admin/environment-management with backward-compatible redirects
• Add environmentAdmin access level with platformAdminEnabled runtime check
• Add EnvironmentAdminGuard to protect environment management routes
• Read admin URLs from group system settings instead of constructing from environment name
• Display response times in friendly units (4.9s instead of 4889ms)
• Rename Migration Health to Environments Monitoring
• Add database migration to restructure admin menu
• Remove environment-setup and backup-and-restore from main admin menu
• Keep maintenance visible on admin menu for all groups