Align app-server create-api-key flow

Co-authored-by: Codex <noreply@openai.com>

codex-rs/app-server-protocol/schema/json/v2/LoginAccountParams.json

@@ -21,27 +21,6 @@
       "title": "ApiKeyv2::LoginAccountParams",
       "type": "object"
     },
-    {
-      "description": "[UNSTABLE] FOR OPENAI INTERNAL USE ONLY - DO NOT USE.",
-      "properties": {
-        "apiKey": {
-          "type": "string"
-        },
-        "type": {
-          "enum": [
-            "ephemeralApiKey"
-          ],
-          "title": "EphemeralApiKeyv2::LoginAccountParamsType",
-          "type": "string"
-        }
-      },
-      "required": [
-        "apiKey",
-        "type"
-      ],
-      "title": "EphemeralApiKeyv2::LoginAccountParams",
-      "type": "object"
-    },
     {
       "properties": {
         "type": {