Add Kotlin and Java API for Dolphin CTC models (#2086)

sherpa-onnx/java-api/src/com/k2fsa/sherpa/onnx/OfflineDolphinModelConfig.java

@@ -0,0 +1,32 @@
+// Copyright 2025 Xiaomi Corporation
+
+package com.k2fsa.sherpa.onnx;
+
+public class OfflineDolphinModelConfig {
+    private final String model;
+
+    private OfflineDolphinModelConfig(Builder builder) {
+        this.model = builder.model;
+    }
+
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    public String getModel() {
+        return model;
+    }
+
+    public static class Builder {
+        private String model = "";
+
+        public OfflineDolphinModelConfig build() {
+            return new OfflineDolphinModelConfig(this);
+        }
+
+        public Builder setModel(String model) {
+            this.model = model;
+            return this;
+        }
+    }
+}