Initial quant trader service baseline

src/main/java/com/quantai/trader/domain/Maps.java

@@ -0,0 +1,17 @@
+package com.quantai.trader.domain;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+final class Maps {
+
+    private Maps() {
+    }
+
+    static Map<String, Object> immutable(Map<String, Object> value) {
+        if (value == null || value.isEmpty()) {
+            return Map.of();
+        }
+        return Map.copyOf(new LinkedHashMap<>(value));
+    }
+}