feat: migrate to CoinAnk API and improve chart UI

- Chart improvements: professional styling, popular symbols quick selection, simplified B/S legend
- Data source migration: use CoinAnk API exclusively for all kline data
- Code cleanup: remove Binance WebSocket cache and related code (websocket_client.go, combined_streams.go, monitor.go)
- Log optimization: reduce hook spam, suppress 404 errors, increase P&L diff threshold
- Lighter integration: add order sync functionality, fix market order precision
- Remove ticker merge logic for simplicity

trader/lighter_trader_v2.go

@@ -389,14 +389,16 @@ func (t *LighterTraderV2) GetTrades(startTime time.Time, limit int) ([]TradeReco
 		}
 	}
 
-	// Build request URL
-	startTimeMs := startTime.UnixMilli()
+	// Build request URL (use Unix timestamp in seconds, not milliseconds)
+	startTimeSec := startTime.Unix()
 	endpoint := fmt.Sprintf("%s/api/v1/trades?account_index=%d&start_time=%d",
-		t.baseURL, t.accountIndex, startTimeMs)
+		t.baseURL, t.accountIndex, startTimeSec)
 	if limit > 0 {
 		endpoint = fmt.Sprintf("%s&limit=%d", endpoint, limit)
 	}
 
+	logger.Infof("🔍 Calling Lighter GetTrades API: %s", endpoint)
+
 	req, err := http.NewRequest("GET", endpoint, nil)
 	if err != nil {
 		return nil, fmt.Errorf("failed to create request: %w", err)