refactor: 重构 Community 目录，将公共组件迁移到 src/components/

- 迁移 klineDataCache.js 到 src/utils/stock/（被 StockChart 使用）
- 迁移 InvestmentCalendar 到 src/components/InvestmentCalendar/（被 Navbar、Dashboard 使用）
- 迁移 DynamicNewsDetail 到 src/components/EventDetailPanel/（被 EventDetail 使用）
- 更新所有相关导入路径，使用路径别名
- 保持 Community 目录其余结构不变

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

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

src/components/EventDetailPanel/index.js

@@ -0,0 +1,6 @@
+// src/components/EventDetailPanel/index.js
+// 统一导出事件详情面板组件
+
+export { default } from './DynamicNewsDetailPanel';
+export { default as DynamicNewsDetailPanel } from './DynamicNewsDetailPanel';
+export { default as EventDetailPanel } from './DynamicNewsDetailPanel';