feat(crypto-tail): 加密价差策略收益曲线与交互优化

- 后端: 收益曲线 API (pnl-curve)、CryptoTailStrategyService.getPnlCurve、gt 扩展导入
- 前端: CryptoTailPnlCurveModal 弹窗，统计卡片+时间筛选+ECharts 累计收益图
- 策略列表: 桌面/移动端「收益曲线」入口，图标改为蓝色(#1890ff)
- 切换时间范围保留旧数据避免图表容器卸载导致空白
- 今日/7天/30天用折线、全部用平滑曲线
- 多语言: viewPnlCurve、pnlCurve.* (zh-CN/zh-TW/en)

Made-with: Cursor

frontend/src/services/api.ts

@@ -494,6 +494,8 @@ export const apiService = {
       endDate?: number
     }) =>
       apiClient.post<ApiResponse<{ list: import('../types').CryptoTailStrategyTriggerDto[]; total: number }>>('/crypto-tail-strategy/triggers', data),
+    pnlCurve: (data: import('../types').CryptoTailPnlCurveRequest) =>
+      apiClient.post<ApiResponse<import('../types').CryptoTailPnlCurveResponse>>('/crypto-tail-strategy/pnl-curve', data),
     marketOptions: () =>
       apiClient.post<ApiResponse<import('../types').CryptoTailMarketOptionDto[]>>('/crypto-tail-strategy/market-options', {}),
     autoMinSpread: (data: { intervalSeconds: number }) =>