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>

src/components/VisxPieChart/VisxPieChart.js

@@ -1,55 +0,0 @@
-import { useState } from "react";
-import { Pie } from "@visx/shape";
-import { Group } from "@visx/group";
-import { Text } from "@visx/text";
-import { useColorModeValue } from "@chakra-ui/react";
-
-const VisxPieChart = ({ data, title, width }) => {
-  const [active, setActive] = useState(null);
-  const half = width / 2;
-
-  const textColor = useColorModeValue("gray.700", "white");
-
-  return (
-    <svg width={width} height={width}>
-      <Group top={half} left={half}>
-        <Pie
-          data={data}
-          pieValue={(data) => data.percentage}
-          outerRadius={half}
-          innerRadius={({ data }) => {
-            const size = active && active.name == data.name ? 12 : 8;
-            return half - size;
-          }}
-          padAngle={0.01}
-        >
-          {(pie) => {
-            return pie.arcs.map((arc) => {
-              return (
-                <g
-                  key={arc.data.name}
-                  onMouseEnter={() => setActive(arc.data)}
-                  onMouseLeave={() => setActive(null)}
-                >
-                  <path d={pie.path(arc)} fill={arc.data.color}></path>
-                </g>
-              );
-            });
-          }}
-        </Pie>
-
-
-        <>
-
-
-          <Text textAnchor="middle" fill={textColor} fontWeight="bold" fontSize={32} dy={20}>
-            {title}
-          </Text>
-        </>
-
-      </Group>
-    </svg>
-  );
-};
-
-export default VisxPieChart;