Support non-streaming zipformer CTC ASR models (#2340)

This PR adds support for non-streaming Zipformer CTC ASR models across 
multiple language bindings, WebAssembly, examples, and CI workflows.

- Introduces a new OfflineZipformerCtcModelConfig in C/C++, Python, Swift, Java, Kotlin, Go, Dart, Pascal, and C# APIs
- Updates initialization, freeing, and recognition logic to include Zipformer CTC in WASM and Node.js
- Adds example scripts and CI steps for downloading, building, and running Zipformer CTC models

Model doc is available at
https://k2-fsa.github.io/sherpa/onnx/pretrained_models/offline-ctc/icefall/zipformer.html

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

@@ -11,6 +11,7 @@ public class OfflineModelConfig {
     private final OfflineNemoEncDecCtcModelConfig nemo;
     private final OfflineSenseVoiceModelConfig senseVoice;
     private final OfflineDolphinModelConfig dolphin;
+    private final OfflineZipformerCtcModelConfig zipformerCtc;
     private final String teleSpeech;
     private final String tokens;
     private final int numThreads;
@@ -28,6 +29,7 @@ public class OfflineModelConfig {
         this.fireRedAsr = builder.fireRedAsr;
         this.moonshine = builder.moonshine;
         this.nemo = builder.nemo;
+        this.zipformerCtc = builder.zipformerCtc;
         this.senseVoice = builder.senseVoice;
         this.dolphin = builder.dolphin;
         this.teleSpeech = builder.teleSpeech;
@@ -52,7 +54,7 @@ public class OfflineModelConfig {
         return transducer;
     }
 
-    public OfflineWhisperModelConfig getZipformer2Ctc() {
+    public OfflineWhisperModelConfig getWhisper() {
         return whisper;
     }
 
@@ -68,6 +70,14 @@ public class OfflineModelConfig {
         return dolphin;
     }
 
+    public OfflineNemoEncDecCtcModelConfig getNemo() {
+        return nemo;
+    }
+
+    public OfflineZipformerCtcModelConfig getZipformerCtc() {
+        return zipformerCtc;
+    }
+
     public String getTokens() {
         return tokens;
     }
@@ -109,6 +119,7 @@ public class OfflineModelConfig {
         private OfflineNemoEncDecCtcModelConfig nemo = OfflineNemoEncDecCtcModelConfig.builder().build();
         private OfflineSenseVoiceModelConfig senseVoice = OfflineSenseVoiceModelConfig.builder().build();
         private OfflineDolphinModelConfig dolphin = OfflineDolphinModelConfig.builder().build();
+        private OfflineZipformerCtcModelConfig zipformerCtc = OfflineZipformerCtcModelConfig.builder().build();
         private String teleSpeech = "";
         private String tokens = "";
         private int numThreads = 1;
@@ -142,6 +153,11 @@ public class OfflineModelConfig {
             return this;
         }
 
+        public Builder setZipformerCtc(OfflineZipformerCtcModelConfig zipformerCtc) {
+            this.zipformerCtc = zipformerCtc;
+            return this;
+        }
+
         public Builder setTeleSpeech(String teleSpeech) {
             this.teleSpeech = teleSpeech;
             return this;

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

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