♻️ 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/MjLogsTable.jsx

@@ -0,0 +1,96 @@
+import React, { useMemo } from 'react';
+import { Table, Empty } from '@douyinfe/semi-ui';
+import {
+  IllustrationNoResult,
+  IllustrationNoResultDark,
+} from '@douyinfe/semi-illustrations';
+import { getMjLogsColumns } from './MjLogsColumnDefs.js';
+
+const MjLogsTable = (mjLogsData) => {
+  const {
+    logs,
+    loading,
+    activePage,
+    pageSize,
+    logCount,
+    compactMode,
+    visibleColumns,
+    handlePageChange,
+    handlePageSizeChange,
+    copyText,
+    openContentModal,
+    openImageModal,
+    isAdminUser,
+    t,
+    COLUMN_KEYS,
+  } = mjLogsData;
+
+  // Get all columns
+  const allColumns = useMemo(() => {
+    return getMjLogsColumns({
+      t,
+      COLUMN_KEYS,
+      copyText,
+      openContentModal,
+      openImageModal,
+      isAdminUser,
+    });
+  }, [
+    t,
+    COLUMN_KEYS,
+    copyText,
+    openContentModal,
+    openImageModal,
+    isAdminUser,
+  ]);
+
+  // Filter columns based on visibility settings
+  const getVisibleColumns = () => {
+    return allColumns.filter((column) => visibleColumns[column.key]);
+  };
+
+  const visibleColumnsList = useMemo(() => {
+    return getVisibleColumns();
+  }, [visibleColumns, allColumns]);
+
+  const tableColumns = useMemo(() => {
+    return compactMode
+      ? visibleColumnsList.map(({ fixed, ...rest }) => rest)
+      : visibleColumnsList;
+  }, [compactMode, visibleColumnsList]);
+
+  return (
+    <Table
+      columns={tableColumns}
+      dataSource={logs}
+      rowKey='key'
+      loading={loading}
+      scroll={compactMode ? undefined : { x: 'max-content' }}
+      className="rounded-xl overflow-hidden"
+      size="middle"
+      empty={
+        <Empty
+          image={
+            <IllustrationNoResult style={{ width: 150, height: 150 }} />
+          }
+          darkModeImage={
+            <IllustrationNoResultDark style={{ width: 150, height: 150 }} />
+          }
+          description={t('搜索无结果')}
+          style={{ padding: 30 }}
+        />
+      }
+      pagination={{
+        currentPage: activePage,
+        pageSize: pageSize,
+        total: logCount,
+        pageSizeOptions: [10, 20, 50, 100],
+        showSizeChanger: true,
+        onPageSizeChange: handlePageSizeChange,
+        onPageChange: handlePageChange,
+      }}
+    />
+  );
+};
+
+export default MjLogsTable;