Fix Codex Responses API base URL

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

internal/gateway/gateway_test.go

@@ -331,7 +331,7 @@ func TestApplyAndRestoreCodex(t *testing.T) {
 		t.Fatalf("injection = %v", out["injection"])
 	}
 	table := injection["table"].(map[string]any)
-	if table["wire_api"] != "responses" || table["base_url"] != "http://127.0.0.1:18787" {
+	if table["wire_api"] != "responses" || table["base_url"] != "http://127.0.0.1:18787/v1" {
 		t.Errorf("injected table = %v", table)
 	}
 	if table["experimental_bearer_token"] != env.store.Config().RelayToken {

internal/gateway/handlers.go

@@ -235,7 +235,7 @@ func (s *Server) applyCodex(w http.ResponseWriter, id string) {
 		return
 	}
 	injection, err := mgr.Apply(codexcfg.ApplyOptions{
-		BaseURL: fmt.Sprintf("http://127.0.0.1:%d", s.port),
+		BaseURL: fmt.Sprintf("http://127.0.0.1:%d/v1", s.port),
 		Token:   s.store.Config().RelayToken,
 	})
 	if err != nil {

src/pages/Codex.test.tsx

@@ -65,7 +65,7 @@ beforeEach(() => {
       table: {
         name: "crossrelay",
         wire_api: "responses",
-        base_url: "http://127.0.0.1:52917",
+        base_url: "http://127.0.0.1:52917/v1",
         experimental_bearer_token: "crl_x",
         requires_openai_auth: "false",
       },