Services are now installed post-setup from the Store page, so the
wizard step that let users pre-select email/calendar/files is removed.
Reduces wizard from 5 steps to 4 (Step4Services deleted, Step5Review
renamed to Step4Review). Backend drops services_enabled validation,
background install thread, and service_store_manager dependency.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
roof
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