Add ASR interim results support in Assistant model and API

- Introduced `asr_interim_enabled` field in the Assistant model to control interim ASR results.
- Updated AssistantBase and AssistantUpdate schemas to include the new field.
- Modified the database schema to add the `asr_interim_enabled` column.
- Enhanced runtime metadata to reflect interim ASR settings.
- Updated API endpoints and tests to validate the new functionality.
- Adjusted documentation to include details about interim ASR results configuration.

engine/adapters/control_plane/backend.py

@@ -249,6 +249,8 @@ class LocalYamlAssistantConfigAdapter(NullBackendAdapter):
                 asr_runtime["apiKey"] = cls._as_str(asr.get("api_key"))
             if cls._as_str(asr.get("api_url")):
                 asr_runtime["baseUrl"] = cls._as_str(asr.get("api_url"))
+            if asr.get("enable_interim") is not None:
+                asr_runtime["enableInterim"] = asr.get("enable_interim")
             if asr.get("interim_interval_ms") is not None:
                 asr_runtime["interimIntervalMs"] = asr.get("interim_interval_ms")
             if asr.get("min_audio_ms") is not None: