📚 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/common/charts/TrendChart.jsx

@@ -0,0 +1,74 @@
+/*
+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 from 'react';
+import { VChart } from '@visactor/react-vchart';
+
+const TrendChart = ({
+  data,
+  color,
+  width = 100,
+  height = 40,
+  config = { mode: 'desktop-browser' }
+}) => {
+  const getTrendSpec = (data, color) => ({
+    type: 'line',
+    data: [{ id: 'trend', values: data.map((val, idx) => ({ x: idx, y: val })) }],
+    xField: 'x',
+    yField: 'y',
+    height: height,
+    width: width,
+    axes: [
+      {
+        orient: 'bottom',
+        visible: false
+      },
+      {
+        orient: 'left',
+        visible: false
+      }
+    ],
+    padding: 0,
+    autoFit: false,
+    legends: { visible: false },
+    tooltip: { visible: false },
+    crosshair: { visible: false },
+    line: {
+      style: {
+        stroke: color,
+        lineWidth: 2
+      }
+    },
+    point: {
+      visible: false
+    },
+    background: {
+      fill: 'transparent'
+    }
+  });
+
+  return (
+    <VChart
+      spec={getTrendSpec(data, color)}
+      option={config}
+    />
+  );
+};
+
+export default TrendChart;