Add ui elements for handling server transfers, add TransferJob.php and TransferService.php

public/themes/pterodactyl/js/admin/server/transfer.js

@@ -0,0 +1,56 @@
+$(document).ready(function () {
+    $('#pNodeId').select2({
+        placeholder: 'Select a Node',
+    }).change();
+
+    $('#pAllocation').select2({
+        placeholder: 'Select a Default Allocation',
+    });
+
+    $('#pAllocationAdditional').select2({
+        placeholder: 'Select Additional Allocations',
+    });
+});
+
+$('#pNodeId').on('change', function () {
+    let currentNode = $(this).val();
+
+    $.each(Pterodactyl.nodeData, function (i, v) {
+        if (v.id == currentNode) {
+            $('#pAllocation').html('').select2({
+                data: v.allocations,
+                placeholder: 'Select a Default Allocation',
+            });
+
+            updateAdditionalAllocations();
+        }
+    });
+});
+
+$('#pAllocation').on('change', function () {
+    updateAdditionalAllocations();
+});
+
+function updateAdditionalAllocations() {
+    let currentAllocation = $('#pAllocation').val();
+    let currentNode = $('#pNodeId').val();
+
+    $.each(Pterodactyl.nodeData, function (i, v) {
+        if (v.id == currentNode) {
+            let allocations = [];
+
+            for (let i = 0; i < v.allocations.length; i++) {
+                const allocation = v.allocations[i];
+
+                if (allocation.id != currentAllocation) {
+                    allocations.push(allocation);
+                }
+            }
+
+            $('#pAllocationAdditional').html('').select2({
+                data: allocations,
+                placeholder: 'Select Additional Allocations',
+            });
+        }
+    });
+}