📚 refactor(dashboard): modularize dashboard page into reusable hooks and components

## Overview
Refactored the monolithic dashboard page (~1200 lines) into a modular architecture following the project's global layout pattern. The main `Detail/index.js` is now simplified to match other page entry files like `Midjourney/index.js`.

## Changes Made

### 🏗️ Architecture Changes
- **Before**: Single large file `pages/Detail/index.js` containing all dashboard logic
- **After**: Modular structure with dedicated hooks, components, and helpers

### 📁 New Files Created
- `hooks/dashboard/useDashboardData.js` - Core data management and API calls
- `hooks/dashboard/useDashboardStats.js` - Statistics computation and memoization
- `hooks/dashboard/useDashboardCharts.js` - Chart specifications and data processing
- `constants/dashboard.constants.js` - UI config, time options, and chart defaults
- `helpers/dashboard.js` - Utility functions for data processing and UI helpers
- `components/dashboard/index.jsx` - Main dashboard component integrating all modules
- `components/dashboard/modals/SearchModal.jsx` - Search modal component

### 🔧 Updated Files
- `constants/index.js` - Added dashboard constants export
- `helpers/index.js` - Added dashboard helpers export
- `pages/Detail/index.js` - Simplified to minimal wrapper (~20 lines)

### 🐛 Bug Fixes
- Fixed SearchModal DatePicker onChange to properly convert Date objects to timestamp strings
- Added missing localStorage update for `data_export_default_time` persistence
- Corrected data flow between search confirmation and chart updates
- Ensured proper chart data refresh after search parameter changes

### ✨ Key Improvements
- **Separation of Concerns**: Data, stats, and charts logic isolated into dedicated hooks
- **Reusability**: Components and hooks can be easily reused across the application
- **Maintainability**: Smaller, focused files easier to understand and modify
- **Consistency**: Follows established project patterns for global folder organization
- **Performance**: Proper memoization and callback optimization maintained

### 🎯 Functional Verification
- ✅ All dashboard panels (model analysis, resource consumption, performance metrics) update correctly
- ✅ Search functionality works with proper parameter validation
- ✅ Chart data refreshes properly after search/filter operations
- ✅ User interface remains identical to original implementation
- ✅ All existing features preserved without regression

### 🔄 Data Flow
```
User Input → SearchModal → useDashboardData → API Call → useDashboardCharts → UI Update
```

## Breaking Changes
None. All existing functionality preserved.

## Migration Notes
The refactored dashboard maintains 100% API compatibility and identical user experience while providing a cleaner, more maintainable codebase structure.

web/src/components/dashboard/modals/SearchModal.jsx

@@ -0,0 +1,101 @@
+/*
+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, { useRef } from 'react';
+import { Modal, Form } from '@douyinfe/semi-ui';
+
+const SearchModal = ({
+  searchModalVisible,
+  handleSearchConfirm,
+  handleCloseModal,
+  isMobile,
+  isAdminUser,
+  inputs,
+  dataExportDefaultTime,
+  timeOptions,
+  handleInputChange,
+  t
+}) => {
+  const formRef = useRef();
+
+  const FORM_FIELD_PROPS = {
+    className: "w-full mb-2 !rounded-lg",
+  };
+
+  const createFormField = (Component, props) => (
+    <Component {...FORM_FIELD_PROPS} {...props} />
+  );
+
+  const { start_timestamp, end_timestamp, username } = inputs;
+
+  return (
+    <Modal
+      title={t('搜索条件')}
+      visible={searchModalVisible}
+      onOk={handleSearchConfirm}
+      onCancel={handleCloseModal}
+      closeOnEsc={true}
+      size={isMobile ? 'full-width' : 'small'}
+      centered
+    >
+      <Form ref={formRef} layout='vertical' className="w-full">
+        {createFormField(Form.DatePicker, {
+          field: 'start_timestamp',
+          label: t('起始时间'),
+          initValue: start_timestamp,
+          value: start_timestamp,
+          type: 'dateTime',
+          name: 'start_timestamp',
+          onChange: (value) => handleInputChange(value, 'start_timestamp')
+        })}
+
+        {createFormField(Form.DatePicker, {
+          field: 'end_timestamp',
+          label: t('结束时间'),
+          initValue: end_timestamp,
+          value: end_timestamp,
+          type: 'dateTime',
+          name: 'end_timestamp',
+          onChange: (value) => handleInputChange(value, 'end_timestamp')
+        })}
+
+        {createFormField(Form.Select, {
+          field: 'data_export_default_time',
+          label: t('时间粒度'),
+          initValue: dataExportDefaultTime,
+          placeholder: t('时间粒度'),
+          name: 'data_export_default_time',
+          optionList: timeOptions,
+          onChange: (value) => handleInputChange(value, 'data_export_default_time')
+        })}
+
+        {isAdminUser && createFormField(Form.Input, {
+          field: 'username',
+          label: t('用户名称'),
+          value: username,
+          placeholder: t('可选值'),
+          name: 'username',
+          onChange: (value) => handleInputChange(value, 'username')
+        })}
+      </Form>
+    </Modal>
+  );
+};
+
+export default SearchModal;