Fix project deletion quota cleanup and update auditing

[yuanzui-cf]

Objective

Keep project lifecycle operations consistent with host allocation, quota accounting, and business audit history.

Scope

• Soft-delete project host bindings when a project is soft-deleted.
• Deprovision source-managed DNS records and release Host quota idempotently.
• Restore the project without automatically restoring domains that may have been reassigned.
• Record effective project configuration changes as project.updated audit events with before/after values in the same transaction.

Acceptance Criteria

• Deleting a project removes its active host bindings from effective Host usage.
• Deleted host names can be bound again according to existing uniqueness rules.
• Restoring a project does not silently reclaim old domains.
• Project name and configuration changes produce a team-visible business audit event.
• Failed audit persistence rolls back the project update.

Constraints

• Preserve existing project soft-delete and administrative restore behavior outside domain restoration.
• Do not expose credentials or secrets in audit changes.