feat: add isSuperuser field and refactor lead conversion to modal

Merged Nguyễn Ngọc Đại requested to merge feature/email-config into main
  • Add isSuperuser field to API user mapping in auth repository
  • Replace native prompt() lead conversion flow with a dedicated modal
  • Add usePipelineStages integration for selecting conversion stage
  • Wire "Lên lịch họp" button to navigate to /calendar

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