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

nodejs-examples/README.md

@@ -154,6 +154,23 @@ rm sherpa-onnx-dolphin-base-ctc-multi-lang-int8-2025-04-02.tar.bz2
 node ./test-offline-dolphin-ctc.js
 ```
 
+## ./test-offline-zipformer-ctc.js
+
+[./test-offline-zipformer-ctc.js](./test-offline-zipformer-ctc.js) demonstrates
+how to decode a file with a Zipformer CTC model. In the code we use
+[sherpa-onnx-zipformer-ctc-zh-int8-2025-07-03](https://k2-fsa.github.io/sherpa/onnx/pretrained_models/offline-ctc/icefall/zipformer.html#sherpa-onnx-zipformer-ctc-zh-int8-2025-07-03-chinese).
+
+You can use the following command to run it:
+
+```bash
+wget https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/sherpa-onnx-zipformer-ctc-zh-int8-2025-07-03.tar.bz2
+
+tar xvf sherpa-onnx-zipformer-ctc-zh-int8-2025-07-03.tar.bz2
+rm sherpa-onnx-zipformer-ctc-zh-int8-2025-07-03.tar.bz2
+
+node ./test-offline-zipformer-ctc.js
+```
+
 ## ./test-offline-nemo-ctc.js
 
 [./test-offline-nemo-ctc.js](./test-offline-nemo-ctc.js) demonstrates

nodejs-examples/test-offline-zipformer-ctc.js

@@ -0,0 +1,35 @@
+// Copyright (c)  2025  Xiaomi Corporation (authors: Fangjun Kuang)
+//
+const fs = require('fs');
+const {Readable} = require('stream');
+const wav = require('wav');
+
+const sherpa_onnx = require('sherpa-onnx');
+
+function createOfflineRecognizer() {
+  let config = {
+    modelConfig: {
+      zipformerCtc: {
+        model: './sherpa-onnx-zipformer-ctc-zh-int8-2025-07-03/model.int8.onnx',
+      },
+      tokens: './sherpa-onnx-zipformer-ctc-zh-int8-2025-07-03/tokens.txt',
+    }
+  };
+
+  return sherpa_onnx.createOfflineRecognizer(config);
+}
+
+const recognizer = createOfflineRecognizer();
+const stream = recognizer.createStream();
+
+const waveFilename =
+    './sherpa-onnx-zipformer-ctc-zh-int8-2025-07-03/test_wavs/0.wav';
+const wave = sherpa_onnx.readWave(waveFilename);
+stream.acceptWaveform(wave.sampleRate, wave.samples);
+
+recognizer.decode(stream);
+const text = recognizer.getResult(stream).text;
+console.log(text);
+
+stream.free();
+recognizer.free();