chore: 移除 visx 图表库依赖

- 删除 src/components/VisxPieChart/ 组件（无引用）
- 清理 DataVisualizationComponents.js 中的 visx 词云实现
- 词云功能统一使用 ECharts 实现
- 卸载 @visx/visx、@visx/responsive 等相关包（共 72 个）

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

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

package.json

@@ -18,11 +18,6 @@
     "@splidejs/react-splide": "^0.7.12",
     "@tanstack/react-virtual": "^3.13.12",
     "@tippyjs/react": "^4.2.6",
-    "@visx/responsive": "^3.12.0",
-    "@visx/scale": "^3.12.0",
-    "@visx/text": "^3.12.0",
-    "@visx/visx": "^3.12.0",
-    "@visx/wordcloud": "^3.12.0",
     "antd": "^5.27.4",
     "axios": "^1.10.0",
     "classnames": "^2.5.1",