feat(frontend): S1 回测核心页（新建/进度/结果 + ECharts 图表）

- api/strategy.ts、api/backtest.ts（含类型）
- 回测-新建（策略下拉+动态参数表单+日期+提交）
- useTask 组合式（轮询+WS 实时阶段）+ 进度页
- 结果页：统计全表 + 资金曲线 + 每日盈亏(红涨绿跌) + 成交表 + K线买卖点
- build 通过；result 接口扩 symbol/start/end 供 K线调用

frontend/src/api/backtest.ts

@@ -0,0 +1,89 @@
+import { apiClient } from './client'
+
+export interface CtaSubmit {
+  symbol: string
+  strategy: string
+  params: Record<string, unknown>
+  start: string
+  end: string
+}
+
+export interface TaskStatus {
+  task_id: string
+  status: string
+  stage: string
+}
+
+export interface EquityPoint {
+  date: string
+  balance: number
+}
+
+export interface PnlPoint {
+  date: string
+  pnl: number
+}
+
+export interface Trade {
+  datetime: string
+  direction: string
+  offset: string
+  price: number
+  volume: number
+  vt_symbol?: string
+}
+
+export interface KlineBar {
+  datetime: string
+  open: number
+  high: number
+  low: number
+  close: number
+  volume: number
+}
+
+export async function submitCta(req: CtaSubmit): Promise<string> {
+  const { data } = await apiClient.post<{ task_id: string }>('/backtest/cta', req)
+  return data.task_id
+}
+
+export async function getStatus(taskId: string): Promise<TaskStatus> {
+  const { data } = await apiClient.get<TaskStatus>(`/task/${taskId}`)
+  return data
+}
+
+export interface BacktestResultInfo {
+  task_id: string
+  statistics: Record<string, unknown>
+  symbol: string
+  start: string
+  end: string
+  strategy: string
+  params: Record<string, unknown>
+  status: string
+}
+
+export async function getResult(taskId: string): Promise<BacktestResultInfo> {
+  const { data } = await apiClient.get<BacktestResultInfo>(`/task/${taskId}/result`)
+  return data
+}
+
+export async function getEquityCurve(taskId: string): Promise<EquityPoint[]> {
+  const { data } = await apiClient.get<{ equity_curve: EquityPoint[] }>(`/task/${taskId}/equity-curve`)
+  return data.equity_curve
+}
+
+export async function getDailyPnl(taskId: string): Promise<PnlPoint[]> {
+  const { data } = await apiClient.get<{ daily_pnl: PnlPoint[] }>(`/task/${taskId}/daily-pnl`)
+  return data.daily_pnl
+}
+
+export async function getTrades(taskId: string): Promise<Trade[]> {
+  const { data } = await apiClient.get<{ trades: Trade[] }>(`/task/${taskId}/trades`)
+  return data.trades
+}
+
+export async function getKline(symbol: string, start: string, end: string): Promise<KlineBar[]> {
+  const { data } = await apiClient.get<{ kline: KlineBar[] }>('/kline', { params: { symbol, start, end } })
+  return data.kline
+}

frontend/src/api/strategy.ts

@@ -0,0 +1,21 @@
+import { apiClient } from './client'
+
+export interface StrategyItem {
+  name: string
+  class_name: string
+}
+
+export interface StrategyParams {
+  parameters: string[]
+  defaults: Record<string, unknown>
+}
+
+export async function getStrategies(): Promise<StrategyItem[]> {
+  const { data } = await apiClient.get<{ strategies: StrategyItem[] }>('/strategy/list')
+  return data.strategies
+}
+
+export async function getParams(name: string): Promise<StrategyParams> {
+  const { data } = await apiClient.get<StrategyParams>(`/strategy/${name}/params`)
+  return data
+}