feat(api): migrate volces client to gateway

apps/api/migrations/0018_volces_api_key_auth.sql

@@ -0,0 +1,19 @@
+UPDATE model_catalog_providers
+SET default_auth_type = 'APIKey',
+    metadata = metadata || jsonb_build_object(
+      'defaultConnectionSource', 'server-main.integration-platform',
+      'defaultAuthTypeSynced', 'APIKey'
+    ),
+    updated_at = now()
+WHERE provider_key = 'volces'
+   OR provider_code = 'volces';
+
+UPDATE integration_platforms
+SET auth_type = 'APIKey',
+    credentials = CASE
+      WHEN credentials ? 'apiKey' THEN credentials
+      ELSE credentials || '{"apiKey": ""}'::jsonb
+    END,
+    updated_at = now()
+WHERE provider = 'volces'
+  AND auth_type = 'AccessKey-SecretKey';