feat: 新增饼图/雷达图图表类型

- 单图模式图表类型新增：饼图（环形占比，第一列=名称/第一系列=数值）、雷达图（多维度对比，第一列=维度/每系列=多边形）
- 多图合并的每张图也可选饼图/雷达图
- 后端 /api/chart 与 /api/combine 的 chartType 支持 pie/radar
- 饼图/雷达图自动隐藏坐标轴/网格/双轴等不适用配置

server.js

@@ -130,6 +130,72 @@ function buildChartOption(params) {
     const textColor = theme === 'dark' ? '#e0e0e0' : '#333333';
     const axisLineColor = theme === 'dark' ? '#444' : '#ddd';
 
+    // 饼图/雷达图：专用构建逻辑（无坐标轴/网格）
+    if (chartType === 'pie' || chartType === 'radar') {
+        const bgC = theme === 'dark' ? '#1a1a2e' : '#ffffff';
+        const txtC = theme === 'dark' ? '#e0e0e0' : '#333333';
+        const tTitle = title ? { text: title, left: 'center', top: 15, textStyle: { color: txtC, fontSize: 18, fontWeight: 600 } } : undefined;
+        if (chartType === 'pie') {
+            // 饼图：第一列=名称，第一个系列=数值
+            const sName = parsedData.seriesNames[0];
+            const data = parsedData.seriesData[sName];
+            const pieData = parsedData.categories.map((c, i) => ({ name: c, value: data[i] || 0 }));
+            return {
+                backgroundColor: bgC,
+                title: tTitle,
+                tooltip: { trigger: 'item', formatter: '{b}: {c} ({d}%)' },
+                legend: showLegend ? { orient: 'vertical', left: 'left', top: title ? 50 : 20, textStyle: { color: txtC, fontSize: 12 } } : { show: false },
+                color: seriesColorsArr,
+                series: [{
+                    type: 'pie',
+                    radius: ['38%', '68%'],
+                    center: ['52%', '55%'],
+                    itemStyle: { borderRadius: 6, borderColor: bgC, borderWidth: 2 },
+                    label: { show: showLabel, formatter: '{b}: {d}%', color: txtC },
+                    labelLine: { show: showLabel },
+                    data: pieData
+                }],
+                animation: false
+            };
+        } else {
+            // 雷达图：第一列=维度名，每个系列=一个雷达多边形
+            const indicator = parsedData.categories.map(c => {
+                let max = 0;
+                parsedData.seriesNames.forEach(n => { parsedData.seriesData[n].forEach(v => { if (v > max) max = v; }); });
+                return { name: c, max: Math.ceil(max * 1.2) || 100 };
+            });
+            return {
+                backgroundColor: bgC,
+                title: tTitle,
+                tooltip: { trigger: 'item' },
+                legend: showLegend ? { orient: 'horizontal', left: 'center', top: title ? 48 : 15, textStyle: { color: txtC, fontSize: 12 } } : { show: false },
+                color: seriesColorsArr,
+                radar: {
+                    indicator,
+                    radius: '62%',
+                    center: ['50%', '55%'],
+                    splitNumber: 5,
+                    axisName: { color: txtC, fontSize: 12 },
+                    splitLine: { lineStyle: { color: theme === 'dark' ? '#444' : '#ddd' } },
+                    splitArea: {
+                        areaStyle: {
+                            color: theme === 'dark' ? ['rgba(79,195,247,0.03)', 'rgba(79,195,247,0.06)'] : ['rgba(79,70,229,0.03)', 'rgba(79,70,229,0.06)']
+                        }
+                    },
+                    axisLine: { lineStyle: { color: theme === 'dark' ? '#444' : '#ddd' } }
+                },
+                series: parsedData.seriesNames.map(n => ({
+                    type: 'radar',
+                    name: n,
+                    data: [{ value: parsedData.seriesData[n], name: n }],
+                    symbolSize: 4,
+                    areaStyle: { opacity: 0.15 }
+                })),
+                animation: false
+            };
+        }
+    }
+
     // 构建系列
     const series = parsedData.seriesNames.map((name, idx) => {
         const dataArr = parsedData.seriesData[name];
@@ -928,7 +994,7 @@ app.get('/api/health', (req, res) => {
     res.json({
         status: 'ok',
         service: 'data-chart-tool',
-        version: '1.13.1',
+        version: '1.14.0',
         endpoints: {
             'POST /api/chart': '生成图表图片（JSON body）',
             'GET /api/chart': '生成图表图片（URL 参数）',
@@ -943,7 +1009,7 @@ app.get('/api/health', (req, res) => {
 app.get('/api/docs', (req, res) => {
     res.json({
         name: '数据可视化图表生成器 API',
-        version: '1.13.1',
+        version: '1.14.0',
         endpoints: [
             {
                 method: 'POST',
@@ -952,7 +1018,7 @@ app.get('/api/docs', (req, res) => {
                 'Content-Type': 'application/json',
                 params: {
                     data: { type: 'string', required: true, description: 'CSV 格式数据（第一行表头，第一列横坐标）' },
-                    chartType: { type: 'string', default: 'bar', options: ['bar', 'line', 'bar-line'], description: '图表类型' },
+                    chartType: { type: 'string', default: 'bar', options: ['bar', 'line', 'bar-line', 'pie', 'radar'], description: '图表类型' },
                     title: { type: 'string', default: '', description: '图表标题' },
                     theme: { type: 'string', default: 'default', options: ['default', 'dark', 'macarons', 'gradient', 'retro', 'ocean', 'forest', 'sunset', 'lavender', 'minimal', 'cherry', 'midnight', 'gold', 'coral', 'mint'], description: '主题风格' },
                     showLegend: { type: 'boolean', default: true, description: '是否显示图例' },