feat(web): M9-3 K线 Chart 组件（candlestick + 量 + MA + Signal↔Fill 标记）

- components/StockChart/CandleChart.tsx：ECharts candlestick（红涨绿跌）+ 成交量副网格 +
  MA20/MA60 叠加 + 事件标记：成交 fills 实心三角、未成交信号空心三角（v3 §20.3）；
  组件只展示不计算；层隔离便于替换 TradingView Lightweight Charts
- lib/types.ts：ChartResult/OHLC/Volume/Series/Marker DTO
- tsc --noEmit 通过

frontend/web/components/StockChart/CandleChart.tsx

@@ -0,0 +1,213 @@
+"use client";
+
+/**
+ * K 线图（v3 §20 Chart）：蜡烛图 + 成交量 + MA 指标 + 事件标记。
+ *
+ * 标记语义（v3 §20.3 Signal↔Fill 严格区分）：
+ * - fills（实际成交）：实心标记 —— fill_buy 红色 ▲ / fill_sell 绿色 ▼
+ * - signals（未成交意图）：空心标记 —— signal_buy 红圈 ▲ / signal_sell 绿圈
+ * 组件只做展示，绝不自行计算（数据来自后端 Chart API）。
+ *
+ * 基于 ECharts candlestick；组件层隔离，便于后续替换 TradingView Lightweight Charts。
+ */
+import { useEffect, useRef } from "react";
+import * as echarts from "echarts/core";
+import { BarChart, CandlestickChart, LineChart, ScatterChart } from "echarts/charts";
+import { GridComponent, TooltipComponent } from "echarts/components";
+import { CanvasRenderer } from "echarts/renderers";
+import type { ChartMarker } from "@/lib/types";
+
+echarts.use([
+  CandlestickChart,
+  LineChart,
+  BarChart,
+  ScatterChart,
+  GridComponent,
+  TooltipComponent,
+  CanvasRenderer,
+]);
+
+const C = {
+  faint: "#8b98b2",
+  line: "rgba(150,165,195,0.13)",
+  tooltipBg: "#141d30",
+  tooltipBorder: "rgba(150,165,195,0.28)",
+  up: "#e5484d",
+  down: "#2fb36b",
+  ma20: "#3fb6ff",
+  ma60: "#d4a72c",
+};
+
+export interface CandleDatum {
+  time: string;
+  open: number;
+  close: number;
+  low: number;
+  high: number;
+}
+
+export function CandleChart({
+  data,
+  volume,
+  indicators = {},
+  fills = [],
+  signals = [],
+  height = 480,
+  name = "",
+}: {
+  data: CandleDatum[];
+  volume?: { time: string; value: number | null }[];
+  indicators?: Record<string, { time: string; value: number | null }[]>;
+  fills?: ChartMarker[];
+  signals?: ChartMarker[];
+  height?: number;
+  name?: string;
+}) {
+  const ref = useRef<HTMLDivElement>(null);
+
+  useEffect(() => {
+    if (!ref.current || data.length === 0) return;
+    const chart = echarts.init(ref.current);
+    const dates = data.map((d) => d.time);
+    const vol = volume ?? [];
+
+    // echarts option 结构较宽，series 用宽松类型（组件层实现细节）
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    const series: any[] = [
+      {
+        name: "K线",
+        type: "candlestick",
+        data: data.map((d) => [d.open, d.close, d.low, d.high]),
+        itemStyle: {
+          color: C.up, // 阳线（收盘>开盘）红涨
+          color0: C.down,
+          borderColor: C.up,
+          borderColor0: C.down,
+        },
+      },
+    ];
+    for (const [name, pts] of Object.entries(indicators)) {
+      const vals = dates.map((t) => {
+        const p = pts.find((x) => x.time === t);
+        return p?.value ?? null;
+      });
+      series.push({
+        name,
+        type: "line",
+        data: vals,
+        smooth: false,
+        showSymbol: false,
+        lineStyle: { width: 1.2 },
+        itemStyle: { color: C[name as keyof typeof C] ?? "#b98bff" },
+        connectNulls: true,
+      });
+    }
+    // 成交标记（实心）与未成交信号（空心）：以散点叠加在价格坐标
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    const mk = (m: ChartMarker, filled: boolean): any => {
+      const buy = m.kind.endsWith("buy");
+      return {
+        value: [m.time, m.price ?? 0],
+        symbol: filled ? (buy ? "triangle" : "triangle") : buy ? "triangle" : "triangle",
+        symbolRotate: buy ? 0 : 180,
+        symbolSize: 13,
+        itemStyle: {
+          color: filled ? (buy ? C.up : C.down) : "transparent",
+          borderColor: buy ? C.up : C.down,
+          borderWidth: 1.6,
+        },
+        tooltip: { formatter: m.text.join("<br/>") },
+      };
+    };
+    series.push(
+      { name: "成交", type: "scatter", data: fills.map((m) => mk(m, true)), z: 6 },
+      { name: "信号(未成交)", type: "scatter", data: signals.map((m) => mk(m, false)), z: 5 }
+    );
+
+    const hasVol = vol.length > 0;
+    const mainGridBottom = hasVol ? 58 : 14;
+    series.push({
+      name: "成交量",
+      type: "bar",
+      xAxisIndex: 1,
+      yAxisIndex: 1,
+      data: dates.map((t) => {
+        const p = vol.find((x) => x.time === t);
+        return p?.value ?? 0;
+      }),
+      itemStyle: { color: "rgba(150,165,195,0.35)" },
+    });
+
+    chart.setOption({
+      backgroundColor: "transparent",
+      tooltip: {
+        trigger: "axis",
+        axisPointer: { type: "cross" },
+        backgroundColor: C.tooltipBg,
+        borderColor: C.tooltipBorder,
+        textStyle: { color: "#e9eef7", fontSize: 12 },
+      },
+      axisPointer: { link: [{ xAxisIndex: "all" }] },
+      grid: [
+        { left: 8, right: 18, top: 16, height: hasVol ? "62%" : "82%", containLabel: true },
+        ...(hasVol
+          ? [{ left: 8, right: 18, top: hasVol ? "76%" : undefined, height: "14%", containLabel: true }]
+          : []),
+      ],
+      xAxis: [
+        {
+          type: "category",
+          data: dates,
+          boundaryGap: true,
+          axisLine: { lineStyle: { color: C.line } },
+          axisTick: { show: false },
+          axisLabel: { color: C.faint, fontSize: 10 },
+          splitLine: { show: false },
+        },
+        ...(hasVol
+          ? [{
+              type: "category",
+              gridIndex: 1,
+              data: dates,
+              boundaryGap: true,
+              axisLine: { lineStyle: { color: C.line } },
+              axisTick: { show: false },
+              axisLabel: { show: false },
+              splitLine: { show: false },
+            }]
+          : []),
+      ],
+      yAxis: [
+        {
+          type: "value",
+          scale: true,
+          splitNumber: 4,
+          axisLabel: { color: C.faint, fontSize: 10 },
+          splitLine: { lineStyle: { color: C.line } },
+        },
+        ...(hasVol
+          ? [{
+              type: "value",
+              gridIndex: 1,
+              scale: true,
+              axisLabel: { color: C.faint, fontSize: 9 },
+              splitLine: { show: false },
+            }]
+          : []),
+      ],
+      series,
+      legend: {
+        show: false,
+      },
+    });
+    const onResize = () => chart.resize();
+    window.addEventListener("resize", onResize);
+    return () => {
+      window.removeEventListener("resize", onResize);
+      chart.dispose();
+    };
+  }, [data, volume, indicators, fills, signals, height]);
+
+  if (data.length === 0) return <div className="hint">暂无 K 线数据</div>;
+  return <div ref={ref} style={{ height, width: "100%" }} aria-label={`${name} K 线图`} />;
+}

frontend/web/lib/types.ts

@@ -186,3 +186,43 @@ export interface SignalRun {
   signal_id: string;
   result: SignalResult;
 }
+
+/* ---- Chart Service（v3 §20，与 domain/entities/chart.py 对应） ---- */
+
+export interface ChartOHLC {
+  time: string;
+  open?: number | null;
+  high?: number | null;
+  low?: number | null;
+  close?: number | null;
+}
+export interface ChartVolumePoint { time: string; value?: number | null }
+export interface ChartSeriesPoint { time: string; value?: number | null }
+export interface ChartMarker {
+  time: string;
+  kind: string; // selection | signal_buy|signal_sell|signal_watch | fill_buy|fill_sell
+  symbol?: string;
+  price?: number | null;
+  score?: number | null;
+  text: string[];
+  ref_id?: string | null;
+}
+export interface ChartResult {
+  metadata: {
+    symbol: string;
+    name?: string;
+    adjust_mode: string;
+    execution_price_basis?: string | null;
+    start?: string | null;
+    end?: string | null;
+    bar_count: number;
+    indicator_windows: number[];
+  };
+  bars: ChartOHLC[];
+  volume: ChartVolumePoint[];
+  indicators: Record<string, ChartSeriesPoint[]>;
+  selections: ChartMarker[];
+  signals: ChartMarker[];
+  fills: ChartMarker[];
+  factor_values?: Record<string, ChartSeriesPoint[]>;
+}