feat: implement vessel ownership transfer feature in portal and backoffice

- Added VesselTransferReviewPage for reviewing and managing vessel transfer requests in backoffice.
- Created VesselTransferApplicationPage for submitting new ownership transfer requests in portal.
- Introduced mock data for vessels and transfer requests in both portal and backoffice.
- Updated navigation and layout to include vessel transfer sections in both applications.
- Added internationalization support for vessel transfer labels in English and Amharic.
- Documented the implementation details and suggested API surface for future integration.

apps/backoffice/src/app/layouts/BackofficeLayout.tsx

@@ -16,6 +16,7 @@ import {
   IconShieldCheck,
   IconRubberStamp,
   IconSettings,
+  IconShip,
   IconUser,
   IconUsers,
   IconUserShield,
@@ -33,6 +34,7 @@ const NAV_ITEMS: NavItem[] = [
   { to: '/seaman-book-queue',    label: 'nav.seamanBookQueue',     icon: IconBook2 },
   { to: '/coc-queue',            label: 'nav.cocQueue',       icon: IconShieldCheck },
   { to: '/endorsement-queue',    label: 'nav.endorsementQueue',     icon: IconRubberStamp },
+  { to: '/vessel-transfers',     label: 'nav.vesselTransfers',      icon: IconShip },
   { to: '/seafarer-registry',    label: 'nav.seafarerRegistry',     icon: IconUsers },
   // { to: '/applications',         label: 'nav.applications',          icon: IconFileDescription },
   { to: '/payment-config',       label: 'nav.paymentConfig',        icon: IconCreditCard },