feat(finalmask): sync transport with upstream Xray core changes

Consolidate the eight legacy mKCP/header UDP mask types into a single mkcp-legacy type ({header, value}), simplify xicmp to {dgram, ips}, and add the new realm UDP mask type, matching the updated Xray-core wire format. Update the FinalMask schema enum, the transport form, the mKCP seeding default, and the backend KCP share-link translation. Refresh golden fixtures/snapshots and add backend coverage for the mapping.

frontend/src/pages/inbounds/list/useInboundColumns.tsx

@@ -153,7 +153,7 @@ export function useInboundColumns({
         title: t('clients'),
         key: 'clients',
         align: 'left',
-        width: 80,
+        width: 110,
         render: (_, record) => {
           const cc = clientCount[record.id];
           if (!cc) return null;