Replace hasRoles calls with hasPermission in all server actions and page
components. Update qualification checks (logistics, intelligence) to use
permission-based checks instead of role name matching. Update staff lookup
in tickets/staff.ts to query roles collection. Use enlistmentDate field
on profile page instead of createdAt.
- Add profile page at /profile/[username] showing user service record
- Update NavUser dropdown to link to Service Record instead of Upgrade to Pro
- Remove unused Billing menu item from user dropdown
