feat: add event coverage for important state changes

[Agbasimere]

Closes: #134

Summary

• add missing event/error/type plumbing for important state changes across archive/reactivate, ownership transfer, moderation, fee consumption, and settings updates
• enrich event payloads with project identifiers, caller/admin context, timestamps, and changed fields that are useful for indexers
• replace the outdated event test suite with focused coverage that verifies event topics and payload payloads for the key state transitions

What Changed

• added typed events for:
  • project archive
  • project reactivate
  • ownership transfer
  • fee consumed
  • review reported
  • review hidden
  • review restored
  • fee config updates
  • minimum project age updates
• expanded fee events to include token/operation metadata
• added missing archive/moderation-related contract errors
• added archived to Project state and implemented archive/reactivate registry methods
• updated verification and fee flows so fee consumption can emit explicit events
• refreshed test helpers/fixtures to match the current registration/update parameter shapes
• rewrote src/tests/events.rs to validate event topics and payloads for the important indexer-facing mutations

Notes

• tests were intentionally not run in this pass
• branch: codex/add-event-coverage-state-changes
• commit: 020ece8

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