♻️ Refactor: Move token unit toggle from table header to filter settings

- Remove K/M switch from model price column header in pricing table
- Add "Display in K units" option to pricing display settings panel
- Update parameter passing for tokenUnit and setTokenUnit across components:
  - PricingDisplaySettings: Add tokenUnit toggle functionality
  - PricingSidebar: Pass tokenUnit props to display settings
  - PricingFilterModal: Include tokenUnit in mobile filter modal
- Enhance resetPricingFilters utility to reset token unit to default 'M'
- Clean up PricingTableColumns by removing unused setTokenUnit parameter
- Add English translation for "按K显示单位" as "Display in K units"

This change improves UX by consolidating all display-related controls
in the filter settings panel, making the interface more organized and
the token unit setting more discoverable alongside other display options.

Affected components:
- PricingTableColumns.js
- PricingDisplaySettings.jsx
- PricingSidebar.jsx
- PricingFilterModal.jsx
- PricingTable.jsx
- utils.js (resetPricingFilters)
- en.json (translations)

web/src/components/table/model-pricing/layout/header/PricingTopSection.jsx

@@ -0,0 +1,111 @@
+/*
+Copyright (C) 2025 QuantumNous
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+For commercial licensing, please contact support@quantumnous.com
+*/
+
+import React, { useMemo, useState } from 'react';
+import { Input, Button } from '@douyinfe/semi-ui';
+import { IconSearch, IconCopy, IconFilter } from '@douyinfe/semi-icons';
+import PricingFilterModal from '../../modal/PricingFilterModal';
+import PricingCategoryIntroWithSkeleton from './PricingCategoryIntroWithSkeleton';
+
+const PricingTopSection = ({
+  selectedRowKeys,
+  copyText,
+  handleChange,
+  handleCompositionStart,
+  handleCompositionEnd,
+  isMobile,
+  sidebarProps,
+  activeKey,
+  modelCategories,
+  categoryCounts,
+  availableCategories,
+  loading,
+  t
+}) => {
+  const [showFilterModal, setShowFilterModal] = useState(false);
+
+  const SearchAndActions = useMemo(() => (
+    <div className="flex items-center gap-4 w-full">
+      {/* 搜索框 */}
+      <div className="flex-1">
+        <Input
+          prefix={<IconSearch />}
+          placeholder={t('模糊搜索模型名称')}
+          onCompositionStart={handleCompositionStart}
+          onCompositionEnd={handleCompositionEnd}
+          onChange={handleChange}
+          showClear
+        />
+      </div>
+
+      {/* 操作按钮 */}
+      <Button
+        theme='outline'
+        type='primary'
+        icon={<IconCopy />}
+        onClick={() => copyText(selectedRowKeys)}
+        disabled={selectedRowKeys.length === 0}
+        className="!bg-blue-500 hover:!bg-blue-600 text-white"
+      >
+        {t('复制')}
+      </Button>
+
+      {/* 移动端筛选按钮 */}
+      {isMobile && (
+        <Button
+          theme="outline"
+          type='tertiary'
+          icon={<IconFilter />}
+          onClick={() => setShowFilterModal(true)}
+        >
+          {t('筛选')}
+        </Button>
+      )}
+    </div>
+  ), [selectedRowKeys, t, handleCompositionStart, handleCompositionEnd, handleChange, copyText, isMobile]);
+
+  return (
+    <>
+      {/* 分类介绍区域（含骨架屏） */}
+      <PricingCategoryIntroWithSkeleton
+        loading={loading}
+        activeKey={activeKey}
+        modelCategories={modelCategories}
+        categoryCounts={categoryCounts}
+        availableCategories={availableCategories}
+        t={t}
+      />
+
+      {/* 搜索和操作区域 */}
+      {SearchAndActions}
+
+      {/* 移动端筛选Modal */}
+      {isMobile && (
+        <PricingFilterModal
+          visible={showFilterModal}
+          onClose={() => setShowFilterModal(false)}
+          sidebarProps={sidebarProps}
+          t={t}
+        />
+      )}
+    </>
+  );
+};
+
+export default PricingTopSection;