goldenChat base source add

backend/src/main/java/com/goldenchart/trading/pipeline/TradeTickEvent.java

@@ -0,0 +1,16 @@
+package com.goldenchart.trading.pipeline;
+
+/**
+ * WebSocket 수신 쓰레드 → 이벤트 큐로 전달하는 불변 체결 틱.
+ */
+public record TradeTickEvent(
+        String market,
+        double tradePrice,
+        double tradeVolume,
+        long tradeTimeMs,
+        long enqueuedAtMs
+) {
+    public static TradeTickEvent of(String market, double price, double volume, long timeMs) {
+        return new TradeTickEvent(market, price, volume, timeMs, System.currentTimeMillis());
+    }
+}