fix(desktop): session persistence — refresh/login/context/empty-content 4-bug fix

1. App.tsx: add restoreSession() call on startup to prevent redirect
   to login page after refresh (isRestoring guard + BootstrapScreen)
2. CloneManager: call syncAgents() after loadClones() to restore
   currentAgent and conversation history on app load
3. zclaw-memory: add get_or_create_session() so frontend session UUID
   is persisted directly — kernel no longer creates mismatched IDs
4. openai.rs: assistant message content must be non-empty for
   Kimi/Qwen APIs — replace empty content with meaningful placeholders

Also includes admin-v2 ModelServices unified page (merge providers +
models + API keys into expandable row layout)

admin-v2/src/pages/Relay.tsx

@@ -2,16 +2,16 @@
 // 中转任务
 // ============================================================
 
+import { useState } from 'react'
 import { useQuery } from '@tanstack/react-query'
-import { Tag, Select, Typography } from 'antd'
+import { Tag, Select } from 'antd'
 import type { ProColumns } from '@ant-design/pro-components'
 import { ProTable } from '@ant-design/pro-components'
 import { relayService } from '@/services/relay'
-import { useState } from 'react'
+import { PageHeader } from '@/components/PageHeader'
+import { ErrorState } from '@/components/ErrorState'
 import type { RelayTask } from '@/types'
 
-const { Title } = Typography
-
 const statusLabels: Record<string, string> = {
   queued: '排队中',
   running: '运行中',
@@ -32,26 +32,57 @@ export default function Relay() {
   const [statusFilter, setStatusFilter] = useState<string | undefined>(undefined)
   const [page, setPage] = useState(1)
 
-  const { data, isLoading } = useQuery({
+  const {
+    data,
+    isLoading,
+    error,
+    refetch,
+  } = useQuery({
     queryKey: ['relay-tasks', page, statusFilter],
     queryFn: ({ signal }) => relayService.list({ page, page_size: 20, status: statusFilter }, signal),
   })
 
+  if (error) {
+    return (
+      <>
+        <PageHeader title="中转任务" description="查看和管理 AI 模型中转请求" />
+        <ErrorState message={(error as Error).message} onRetry={() => refetch()} />
+      </>
+    )
+  }
+
   const columns: ProColumns<RelayTask>[] = [
-    { title: 'ID', dataIndex: 'id', width: 120, render: (_, r) => <code>{r.id.substring(0, 8)}...</code> },
+    {
+      title: 'ID',
+      dataIndex: 'id',
+      width: 120,
+      render: (_, r) => (
+        <code className="text-xs px-1.5 py-0.5 rounded bg-neutral-100 dark:bg-neutral-800">
+          {r.id.substring(0, 8)}...
+        </code>
+      ),
+    },
     {
       title: '状态',
       dataIndex: 'status',
       width: 100,
-      render: (_, r) => <Tag color={statusColors[r.status] || 'default'}>{statusLabels[r.status] || r.status}</Tag>,
+      render: (_, r) => (
+        <Tag color={statusColors[r.status] || 'default'}>
+          {statusLabels[r.status] || r.status}
+        </Tag>
+      ),
     },
     { title: '模型', dataIndex: 'model_id', width: 160 },
     { title: '优先级', dataIndex: 'priority', width: 70 },
     { title: '尝试次数', dataIndex: 'attempt_count', width: 80 },
     {
-      title: 'Token',
+      title: 'Token (入/出)',
       width: 140,
-      render: (_, r) => `${r.input_tokens.toLocaleString()} / ${r.output_tokens.toLocaleString()}`,
+      render: (_, r) => (
+        <span className="text-sm">
+          {r.input_tokens.toLocaleString()} / {r.output_tokens.toLocaleString()}
+        </span>
+      ),
     },
     { title: '错误信息', dataIndex: 'error_message', width: 200, ellipsis: true },
     {
@@ -64,30 +95,36 @@ export default function Relay() {
       title: '完成时间',
       dataIndex: 'completed_at',
       width: 180,
-      render: (_, r) => r.completed_at ? new Date(r.completed_at).toLocaleString('zh-CN') : '-',
+      render: (_, r) => (r.completed_at ? new Date(r.completed_at).toLocaleString('zh-CN') : '-'),
     },
   ]
 
   return (
     <div>
-      <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: 24 }}>
-        <Title level={4} style={{ margin: 0 }}>中转任务</Title>
-        <Select
-          value={statusFilter}
-          onChange={(v) => { setStatusFilter(v === 'all' ? undefined : v); setPage(1) }}
-          placeholder="状态筛选"
-          style={{ width: 140 }}
-          allowClear
-          options={[
-            { value: 'all', label: '全部' },
-            { value: 'queued', label: '排队中' },
-            { value: 'running', label: '运行中' },
-            { value: 'completed', label: '已完成' },
-            { value: 'failed', label: '失败' },
-            { value: 'cancelled', label: '已取消' },
-          ]}
-        />
-      </div>
+      <PageHeader
+        title="中转任务"
+        description="查看和管理 AI 模型中转请求"
+        actions={
+          <Select
+            value={statusFilter}
+            onChange={(v) => {
+              setStatusFilter(v === 'all' ? undefined : v)
+              setPage(1)
+            }}
+            placeholder="状态筛选"
+            className="w-36"
+            allowClear
+            options={[
+              { value: 'all', label: '全部' },
+              { value: 'queued', label: '排队中' },
+              { value: 'running', label: '运行中' },
+              { value: 'completed', label: '已完成' },
+              { value: 'failed', label: '失败' },
+              { value: 'cancelled', label: '已取消' },
+            ]}
+          />
+        }
+      />
 
       <ProTable<RelayTask>
         columns={columns}