feat(models): support ASR model selection in web console

tests/test_models_handler.py

@@ -54,6 +54,46 @@ class TestModelsHandler(unittest.TestCase):
         write_file.assert_called_once_with(file_config)
         refresh_voice.assert_called_once()
 
+    def test_set_asr_empty_model_keeps_existing(self):
+        # Switching provider with an empty model must not wipe a user's
+        # hand-configured voice_to_text_model.
+        from channel.web.web_channel import ModelsHandler
+
+        local_config = {"voice_to_text_model": "qwen3-asr-flash"}
+        file_config = {"voice_to_text_model": "qwen3-asr-flash"}
+        handler = ModelsHandler()
+
+        with patch("channel.web.web_channel.conf", return_value=local_config):
+            with patch.object(ModelsHandler, "_read_file_config", return_value=file_config):
+                with patch.object(ModelsHandler, "_write_file_config"):
+                    with patch.object(ModelsHandler, "_refresh_voice_routing"):
+                        result = json.loads(handler._handle_set_capability({
+                            "capability": "asr",
+                            "provider_id": "zhipu",
+                            "model": "",
+                        }))
+
+        self.assertEqual(result["status"], "success")
+        self.assertEqual(local_config["voice_to_text"], "zhipu")
+        # Existing model preserved, not overwritten with "".
+        self.assertEqual(local_config["voice_to_text_model"], "qwen3-asr-flash")
+        self.assertEqual(file_config["voice_to_text_model"], "qwen3-asr-flash")
+        self.assertEqual(result["model"], "qwen3-asr-flash")
+
+    def test_asr_capability_exposes_provider_models(self):
+        from channel.web.web_channel import ModelsHandler
+
+        cap = ModelsHandler._asr_capability({
+            "voice_to_text": "dashscope",
+            "voice_to_text_model": "qwen3-asr-flash",
+        })
+
+        self.assertTrue(cap["editable"])
+        self.assertEqual(cap["current_provider"], "dashscope")
+        self.assertEqual(cap["current_model"], "qwen3-asr-flash")
+        self.assertIn("provider_models", cap)
+        self.assertIn("dashscope", cap["provider_models"])
+
 
 if __name__ == "__main__":
     unittest.main()