perf(MarketDataView): 优化加载状态，使用骨架屏避免布局跳动

- useMarketData: 新增 hasLoaded 状态，优化首次加载 loading 逻辑
- 导出 SummaryCardSkeleton 组件用于概览卡片占位
- MarketDataView: 使用骨架屏替代空白占位
- DeepAnalysisTab: 使用 skeleton 变体替代 spinner

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/views/Company/components/CompanyOverview/DeepAnalysisTab/index.tsx

@@ -77,7 +77,7 @@ const DeepAnalysisTab: React.FC<DeepAnalysisTabProps> = ({
             themePreset="blackGold"
             size="sm"
           />
-          <LoadingState message="加载数据中..." height="200px" />
+          <LoadingState variant="skeleton" height="300px" skeletonRows={6} />
         </CardBody>
       </Card>
     );