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

scripts/dotnet/OfflineModelConfig.cs

@@ -27,6 +27,7 @@ namespace SherpaOnnx
             Moonshine = new OfflineMoonshineModelConfig();
             FireRedAsr = new OfflineFireRedAsrModelConfig();
             Dolphin = new OfflineDolphinModelConfig();
+            ZipformerCtc = new OfflineZipformerCtcModelConfig();
         }
         public OfflineTransducerModelConfig Transducer;
         public OfflineParaformerModelConfig Paraformer;
@@ -60,5 +61,6 @@ namespace SherpaOnnx
         public OfflineMoonshineModelConfig Moonshine;
         public OfflineFireRedAsrModelConfig FireRedAsr;
         public OfflineDolphinModelConfig Dolphin;
+        public OfflineZipformerCtcModelConfig ZipformerCtc;
     }
 }