♻️ refactor: restructure MjLogsTable into modular component architecture

Refactor the monolithic MjLogsTable component (971 lines) into a modular,
maintainable architecture following the same pattern as LogsTable refactor.

## What Changed

### 🏗️ Architecture
- Split large single file into focused, single-responsibility components
- Introduced custom hook `useMjLogsData` for centralized state management
- Created dedicated column definitions file for better organization
- Implemented specialized modal components for Midjourney-specific features

### 📁 New Structure
```
web/src/components/table/mj-logs/
├── index.jsx                    # Main page component orchestrator
├── MjLogsTable.jsx             # Pure table rendering component
├── MjLogsActions.jsx           # Actions area (banner + compact mode)
├── MjLogsFilters.jsx           # Search form component
├── MjLogsColumnDefs.js         # Column definitions and renderers
└── modals/
    ├── ColumnSelectorModal.jsx # Column visibility settings
    └── ContentModal.jsx        # Content viewer (text + image preview)

web/src/hooks/mj-logs/
└── useMjLogsData.js            # Custom hook for state & logic
```

### 🎯 Key Improvements
- **Maintainability**: Clear separation of concerns, easier to understand
- **Reusability**: Modular components can be reused independently
- **Performance**: Optimized with `useMemo` for column rendering
- **Testing**: Single-responsibility components easier to test
- **Developer Experience**: Better code organization and readability

### 🎨 Midjourney-Specific Features Preserved
- All task type rendering with icons (IMAGINE, UPSCALE, VARIATION, etc.)
- Status rendering with appropriate colors and icons
- Image preview functionality for generated artwork
- Progress indicators for task completion
- Admin-only columns for channel and submission results
- Banner notification system for callback settings

### 🔧 Technical Details
- Centralized all business logic in `useMjLogsData` custom hook
- Extracted comprehensive column definitions with Lucide React icons
- Split complex UI into focused components (table, actions, filters, modals)
- Maintained responsive design patterns for mobile compatibility
- Preserved admin permission handling for restricted features

### 🐛 Fixes
- Improved component prop passing patterns
- Enhanced type safety through better state management
- Optimized rendering performance with proper memoization

## Breaking Changes
None - all existing imports and functionality preserved.

web/src/components/table/mj-logs/index.jsx

@@ -0,0 +1,33 @@
+import React from 'react';
+import { Layout } from '@douyinfe/semi-ui';
+import CardPro from '../../common/ui/CardPro.js';
+import MjLogsTable from './MjLogsTable.jsx';
+import MjLogsActions from './MjLogsActions.jsx';
+import MjLogsFilters from './MjLogsFilters.jsx';
+import ColumnSelectorModal from './modals/ColumnSelectorModal.jsx';
+import ContentModal from './modals/ContentModal.jsx';
+import { useMjLogsData } from '../../../hooks/mj-logs/useMjLogsData.js';
+
+const MjLogsPage = () => {
+  const mjLogsData = useMjLogsData();
+
+  return (
+    <>
+      {/* Modals */}
+      <ColumnSelectorModal {...mjLogsData} />
+      <ContentModal {...mjLogsData} />
+
+      <Layout>
+        <CardPro
+          type="type2"
+          statsArea={<MjLogsActions {...mjLogsData} />}
+          searchArea={<MjLogsFilters {...mjLogsData} />}
+        >
+          <MjLogsTable {...mjLogsData} />
+        </CardPro>
+      </Layout>
+    </>
+  );
+};
+
+export default MjLogsPage;