feat(config): default to WebSocket and migrate saved HTTP settings

apps/showcase_ui/src/app/components/model-settings/model-settings.component.ts

@@ -109,7 +109,7 @@ interface ModelSettings {
   `]
 })
 export class ModelSettingsComponent implements OnInit {
-  transport: 'http' | 'websocket' = 'http';
+  transport: 'http' | 'websocket' = 'websocket';
   readonly reasoningValues = REASONING_VALUES;
   readonly reasoningLabels = REASONING_LABELS;
   private http = inject(HttpClient);
@@ -144,7 +144,7 @@ export class ModelSettingsComponent implements OnInit {
   }
   private apply(config: ModelSettings): void {
     this.baseUrl = config.base_url; this.model = config.model; this.timeout = config.timeout_seconds;
-    this.transport = config.transport ?? 'http';
+    this.transport = config.transport ?? 'websocket';
     this.modelPresets = config.model_presets;
     this.retries = config.max_retries; this.retryInterval = config.retry_interval_seconds ?? 10; this.reasoning = config.reasoning_effort ?? 'high'; this.keyConfigured.set(config.api_key_configured); this.envPath.set(config.env_path);
     this.rateLimitRetry = config.rate_limit_retry_seconds ?? 60;