chore: replace TRXUSDT with SOLUSDT in trading symbols

- Switch SYMBOLS from XRPUSDT,TRXUSDT,DOGEUSDT to XRPUSDT,SOLUSDT,DOGEUSDT
- Add SOLUSDT params: SL=1.0x, TP=4.0x, ADX=20, margin_max=0.08
- Remove TRXUSDT params from .env.example

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.env.example

@@ -1,6 +1,6 @@
 BINANCE_API_KEY=
 BINANCE_API_SECRET=
-SYMBOLS=XRPUSDT
+SYMBOLS=XRPUSDT,SOLUSDT,DOGEUSDT
 CORRELATION_SYMBOLS=BTCUSDT,ETHUSDT
 LEVERAGE=10
 RISK_PER_TRADE=0.02
@@ -20,9 +20,10 @@ ATR_SL_MULT_XRPUSDT=1.5
 ATR_TP_MULT_XRPUSDT=4.0
 ADX_THRESHOLD_XRPUSDT=30
 
-ATR_SL_MULT_TRXUSDT=1.0
-ATR_TP_MULT_TRXUSDT=4.0
-ADX_THRESHOLD_TRXUSDT=30
+ATR_SL_MULT_SOLUSDT=1.0
+ATR_TP_MULT_SOLUSDT=4.0
+ADX_THRESHOLD_SOLUSDT=20
+MARGIN_MAX_RATIO_SOLUSDT=0.08
 
 ATR_SL_MULT_DOGEUSDT=2.0
 ATR_TP_MULT_DOGEUSDT=2.0