fix: WS stream sembol adına USDT ekle

src/bot/runner.rs

@@ -43,12 +43,13 @@ impl BotRunner {
         let client = BinanceClient::new(api_key, api_secret, config.testnet);
         // Fiyat verisi her zaman canlı Binance stream'inden gelir
         let ws_base = BINANCE_WS_URL;
-        let stream = format!(
-            "{}/{}@kline_{}",
-            ws_base,
-            config.symbol.to_lowercase(),
-            config.timeframe.as_str()
-        );
+        let symbol_lower = config.symbol.to_lowercase();
+        let stream_symbol = if symbol_lower.ends_with("usdt") {
+            symbol_lower
+        } else {
+            format!("{}usdt", symbol_lower)
+        };
+        let stream = format!("{}/{}@kline_{}", ws_base, stream_symbol, config.timeframe.as_str());
 
         info!("[{}] Bot başlatıldı. WS: {}", config.symbol, stream);