feat: redesign indicator editor with required raw klines and improved UX

Backend:
- Add enable_raw_klines field to IndicatorConfig (always true, required)
- Change defaults: disable EMA/MACD/RSI/ATR, keep volume/OI/funding enabled

Frontend:
- Completely redesign IndicatorEditor with 4 clear sections:
  1. Market Data: Raw OHLCV (required, locked) + timeframe selection
  2. Technical Indicators: EMA/MACD/RSI/ATR (optional, AI can calculate)
  3. Market Sentiment: Volume/OI/Funding Rate
  4. Quant Data: External API integration
- Add helpful tips and descriptions in both Chinese and English
- Improve visual hierarchy with section headers and color coding
- Auto-ensure enable_raw_klines is always true

web/src/types.ts

@@ -394,6 +394,9 @@ export interface CoinSourceConfig {
 
 export interface IndicatorConfig {
   klines: KlineConfig;
+  // Raw OHLCV kline data - required for AI analysis
+  enable_raw_klines: boolean;
+  // Technical indicators (optional)
   enable_ema: boolean;
   enable_macd: boolean;
   enable_rsi: boolean;