Refactor exporting NeMo models (#2362)

Refactors and extends model export support to include new NeMo Parakeet TDT int8 variants for English and Japanese, updating the Kotlin API, export scripts, test runners, and CI workflows.

- Added support for two new int8 model types in OfflineRecognizer.kt.
- Enhanced Python export scripts to perform dynamic quantization and metadata injection.
- Updated shell scripts and GitHub workflows to package, test, and publish int8 model artifacts.

scripts/apk/generate-vad-asr-apk-script.py

@@ -565,6 +565,38 @@ def get_models():
 
             ls -lh
 
+            popd
+            """,
+        ),
+        Model(
+            model_name="sherpa-onnx-nemo-parakeet_tdt_ctc_110m-en-36000-int8",
+            idx=33,
+            lang="en",
+            lang2="English",
+            short_name="parakeet_tdt_ctc_110m",
+            cmd="""
+            pushd $model_name
+
+            rm -rfv test_wavs
+
+            ls -lh
+
+            popd
+            """,
+        ),
+        Model(
+            model_name="sherpa-onnx-nemo-parakeet-tdt_ctc-0.6b-ja-35000-int8",
+            idx=34,
+            lang="ja",
+            lang2="Japanese",
+            short_name="parakeet-tdt_ctc_0.6b_ja",
+            cmd="""
+            pushd $model_name
+
+            rm -rfv test_wavs
+
+            ls -lh
+
             popd
             """,
         ),