refactor: Community 目录结构重组 + 修复导入路径 + 添加 Mock 数据

## 目录重构
- DynamicNewsCard/ → DynamicNews/（含 layouts/, hooks/ 子目录）
- EventCard 原子组件 → EventCard/atoms/
- EventDetailModal 独立目录化
- HotEvents 独立目录化（含 CSS）
- SearchFilters 独立目录化（CompactSearchBox, TradingTimeFilter）

## 导入路径修复
- EventCard/*.js: 统一使用 @constants/, @utils/, @components/ 别名
- atoms/*.js: 修复移动后的相对路径问题
- DynamicNewsCard.js: 更新 contexts, store, constants 导入
- EventHeaderInfo.js, CompactMetaBar.js: 修复 EventFollowButton 导入

## Mock Handler 添加
- /api/events/:eventId/expectation-score - 事件超预期得分
- /api/index/:indexCode/realtime - 指数实时行情

## 警告修复
- CitationMark.js: overlayInnerStyle → styles (Antd 5.x)
- CitedContent.js: 移除不支持的 jsx 属性

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

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

src/components/Citation/CitationMark.js

@@ -121,7 +121,7 @@ const CitationMark = ({ citationId, citation }) => {
             title={`引用来源 [${citationId}]`}
             trigger={triggerType}
             placement="top"
-            overlayInnerStyle={{ maxWidth: 340, padding: '8px' }}
+            styles={{ body: { maxWidth: 340, padding: '8px' } }}
             open={popoverVisible}
             onOpenChange={setPopoverVisible}
             zIndex={2000}

src/components/Citation/CitedContent.js

@@ -146,7 +146,7 @@ const CitedContent = ({
             </div>
 
             {/* 响应式样式 */}
-            <style jsx>{`
+            <style>{`
                 @media (max-width: 768px) {
                     .ai-badge-responsive {
                         font-size: 10px !important;

src/components/EventDetailPanel/CompactMetaBar.js

@@ -10,7 +10,7 @@ import {
   useColorModeValue,
 } from '@chakra-ui/react';
 import { ViewIcon } from '@chakra-ui/icons';
-import EventFollowButton from '@views/Community/components/EventCard/EventFollowButton';
+import { EventFollowButton } from '@views/Community/components/EventCard/atoms';
 
 /**
  * 精简信息栏组件

src/components/EventDetailPanel/EventHeaderInfo.js

@@ -15,7 +15,7 @@ import {
 import { ViewIcon } from '@chakra-ui/icons';
 import dayjs from 'dayjs';
 import StockChangeIndicators from '../StockChangeIndicators';
-import EventFollowButton from '@views/Community/components/EventCard/EventFollowButton';
+import { EventFollowButton } from '@views/Community/components/EventCard/atoms';
 
 /**
  * 事件头部信息区组件