feat: Refactor `coverage_type` to use u32, update contract event topi…#417

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K1NGD4VID wants to merge 2 commits intoRemitwise-Org:mainfrom

K1NGD4VID:feature/insurance-deactivate-transition-hardening

Commits on Mar 27, 2026

feat: Refactor `coverage_type` to use u32, update contract event topics, and add data migration documentation.
K1NGD4VID
committed
refactor: Refine upgrade admin authorization logic, add orchestrator audit log test helpers, and remove legacy bill payment functions and redundant code.
K1NGD4VID
committed