refactor: 提取 ConceptStocksModal 为通用组件，统一概念中心和个股中心弹窗

- 将 ConceptStocksModal 从 StockOverview/components 移到 components 目录
- 概念中心复用 ConceptStocksModal，删除冗余的 renderStockTable 函数（约100行）
- 统一 H5 端弹窗体验：响应式尺寸、高度限制(70vh)、左右滑动、垂直居中
- 移除重复的底部关闭按钮，只保留右上角关闭按钮
- 添加"板块原因"列，表头改为中文
- 使用 @components 路径别名

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

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

src/views/StockOverview/index.js

@@ -56,7 +56,7 @@ import {
 } from '@chakra-ui/react';
 import { SearchIcon, CloseIcon, ArrowForwardIcon, TrendingUpIcon, InfoIcon, ChevronRightIcon, MoonIcon, SunIcon, CalendarIcon } from '@chakra-ui/icons';
 import { FaChartLine, FaFire, FaRocket, FaBrain, FaCalendarAlt, FaChevronRight, FaArrowUp, FaArrowDown, FaChartBar } from 'react-icons/fa';
-import ConceptStocksModal from './components/ConceptStocksModal';
+import ConceptStocksModal from '@components/ConceptStocksModal';
 import { BsGraphUp, BsLightningFill } from 'react-icons/bs';
 import * as echarts from 'echarts';
 import { logger } from '../../utils/logger';