add proguard rules

Author: wenxi-zeng

substrata-kotlin/consumer-rules.pro

@@ -0,0 +1,7 @@
+# Keep all Substrata and LivePlugins classes
+-keep class com.segment.analytics.substrata.kotlin.** { *; }
+
+# Keep native methods - critical for QuickJS JNI integration
+-keepclasseswithmembernames class * {
+    native <methods>;
+}