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
Add four admin-only endpoints under /api/admin/settings:
- GET / — full config (secrets redacted)
- GET /{module} — single module config
- PUT /{module} — toggle modules + persist config overrides
- POST /{module}/test — test external connectivity (database, storage)
PUT publishes a settings.changed SSE event. Config overrides are
persisted for future hot-reload support; changes to database/storage/
server/schemas namespaces return restart_required: true.
Wires SettingsRepository into Server struct.
Closes#99
