feat(gateway): add Codex Live and OpenAI Realtime

Implement preflighted Live/Realtime WebSocket transports, protocol-aware authentication, usage auditing, UI filtering, and legacy Codex permission migration.

frontend/src/features/providers/components/provider-tabs/__tests__/model-test-request.spec.ts

@@ -317,6 +317,8 @@ describe('buildExactModelMappingTestRequest', () => {
 
 describe('isModelTestableApiFormat', () => {
   it.each([
+    'openai:realtime',
+    'codex:live',
     'openai:video',
     'gemini:video',
     'gemini:files',

frontend/src/features/providers/components/provider-tabs/model-test-capabilities.ts

@@ -24,6 +24,8 @@ export type ModelTestKeySource = {
 }
 
 const MODEL_TEST_UNSUPPORTED_API_FORMATS = new Set([
+  'openai:realtime',
+  'codex:live',
   'openai:video',
   'gemini:video',
   'gemini:files',