Add admin-only Module Configuration section to the Settings page.
Each module gets a collapsible card with enable/disable toggle,
status badge, module-specific config fields, save and test
connectivity buttons.
- AdminModules: fetches GET /api/modules + GET /api/admin/settings,
renders Infrastructure and Features groups, restart banner
- ModuleCard: collapsible card with toggle, status badge, field
layouts per module, save (PUT) and test (POST) actions
- TypeScript types for ModuleInfo, ModulesResponse, admin settings
API response shapes
Ref: #100
0be39065ac