feat: add BOLL (Bollinger Bands) indicator to Strategy Studio

- Add BOLL to frontend indicator grid with period selection
- Add BOLL calculation (upper/middle/lower bands) in market data
- Add BOLL fields to TimeframeSeriesData struct
- Integrate BOLL into AI decision engine prompts
- Support multi-timeframe BOLL analysis

web/src/types.ts

@@ -467,12 +467,14 @@ export interface IndicatorConfig {
   enable_macd: boolean;
   enable_rsi: boolean;
   enable_atr: boolean;
+  enable_boll: boolean;
   enable_volume: boolean;
   enable_oi: boolean;
   enable_funding_rate: boolean;
   ema_periods?: number[];
   rsi_periods?: number[];
   atr_periods?: number[];
+  boll_periods?: number[];
   external_data_sources?: ExternalDataSource[];
   // 量化数据源（资金流向、持仓变化、价格变化）
   enable_quant_data?: boolean;