fix(SubTabContainer): 移除外层 Suspense，Tab 内容直接展示

- SubTabContainer 内部为每个 Tab 添加 Suspense fallback={null}
- 移除 Company/index.tsx 外层 Suspense 和 TabLoadingFallback
- 切换一级 Tab 时不再显示整体 loading，直接展示内容

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

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

src/components/SubTabContainer/index.tsx

@@ -19,7 +19,7 @@
  * ```
  */
 
-import React, { useState, useCallback, memo } from 'react';
+import React, { useState, useCallback, memo, Suspense } from 'react';
 import {
   Box,
   Tabs,
@@ -311,7 +311,9 @@ const SubTabContainer: React.FC<SubTabContainerProps> = memo(({
             return (
               <TabPanel key={tab.key} p={0}>
                 {shouldRender && Component ? (
-                  <Component {...componentProps} />
+                  <Suspense fallback={null}>
+                    <Component {...componentProps} />
+                  </Suspense>
                 ) : null}
               </TabPanel>
             );