fix: 修复变动金额列的渲染逻辑，确保正确显示金额

src/views/user/components/ledger.vue

@@ -26,10 +26,15 @@ const columns: TableBaseColumns = [
   },
   {
     key: 'amount',
-    title: '变动金额',
-    render: (row: any) => {
-      return Number(row.frozen);
-    }
+    title: '变动金额'
+  },
+  {
+    key: 'availableAfter',
+    title: '变动后可用余额'
+  },
+  {
+    key: 'availableBefore',
+    title: '变动前可用余额'
   },
   {
     key: 'memo',