feat(codex): Cursor compatibility + Next.js 16 proxy migration

- Force streaming for Codex/OpenAI models to fix non-streaming bug
- Strip unsupported params (user, metadata, stream_options, prompt_cache_retention)
- Force response translation from openai-responses to openai format
- Migrate middleware.js to proxy.js for Next.js 16
- Use webpack explicitly in dev/build scripts
- Updated Codex User-Agent

open-sse/config/constants.js

@@ -39,9 +39,9 @@ export const PROVIDERS = {
     baseUrl: "https://chatgpt.com/backend-api/codex/responses",
     format: "openai-responses", // Use OpenAI Responses API format (reuse translator)
     headers: {
-      "Version": "0.21.0",
+      "Version": "0.92.0",
       "Openai-Beta": "responses=experimental",
-      "User-Agent": "codex_cli_rs/0.50.0 (Mac OS 26.0.1; arm64)"
+      "User-Agent": "codex-cli/0.92.0 (Windows 10.0.26100; x64)"
     },
     // OpenAI OAuth configuration
     clientId: "app_EMoamEEZ73f0CkXaXp7hrann",

open-sse/executors/codex.js

@@ -32,6 +32,11 @@ export class CodexExecutor extends BaseExecutor {
     delete body.top_logprobs;
     delete body.n;
     delete body.seed;
+    delete body.max_tokens;
+    delete body.user; // Cursor sends this but Codex doesn't support it
+    delete body.prompt_cache_retention; // Cursor sends this but Codex doesn't support it
+    delete body.metadata; // Cursor sends this but Codex doesn't support it
+    delete body.stream_options; // Cursor sends this but Codex doesn't support it
 
     return body;
   }

open-sse/handlers/chatCore.js

@@ -253,7 +253,9 @@ export async function handleChatCore({ body, modelInfo, credentials, log, onCred
   const alias = PROVIDER_ID_TO_ALIAS[provider] || provider;
   const modelTargetFormat = getModelTargetFormat(alias, model);
   const targetFormat = modelTargetFormat || getTargetFormat(provider);
-  const stream = body.stream !== false;
+
+  // Force streaming for OpenAI/Codex models (they don't support non-streaming mode properly)
+  const stream = (provider === 'openai' || provider === 'codex') ? true : (body.stream !== false);
 
   // Create request logger for this session: sourceFormat_targetFormat_model
   const reqLogger = await createRequestLogger(sourceFormat, targetFormat, model);
@@ -459,8 +461,14 @@ export async function handleChatCore({ body, modelInfo, credentials, log, onCred
 
   // Create transform stream with logger for streaming response
   let transformStream;
-  if (needsTranslation(targetFormat, sourceFormat)) {
-    transformStream = createSSETransformStreamWithLogger(targetFormat, sourceFormat, provider, reqLogger, toolNameMap, model, connectionId);
+  // For Codex provider, always translate response from openai-responses to openai format
+  // This ensures clients like Cursor get the expected chat completions format
+  const needsCodexTranslation = (provider === 'codex' || provider === 'openai') && targetFormat === 'openai-responses';
+  if (needsCodexTranslation || needsTranslation(targetFormat, sourceFormat)) {
+    // For Codex, translate FROM openai-responses TO openai (client's expected format)
+    const responseSourceFormat = needsCodexTranslation ? 'openai-responses' : targetFormat;
+    const responseTargetFormat = needsCodexTranslation ? 'openai' : sourceFormat;
+    transformStream = createSSETransformStreamWithLogger(responseSourceFormat, responseTargetFormat, provider, reqLogger, toolNameMap, model, connectionId);
   } else {
     transformStream = createPassthroughStreamWithLogger(provider, reqLogger, model, connectionId);
   }

package.json

@@ -4,8 +4,8 @@
   "description": "9Router web dashboard",
   "private": true,
   "scripts": {
-    "dev": "next dev",
-    "build": "next build",
+    "dev": "next dev --webpack",
+    "build": "next build --webpack",
     "start": "next start"
   },
   "dependencies": {
@@ -18,21 +18,21 @@
     "jose": "^6.1.3",
     "lowdb": "^7.0.1",
     "monaco-editor": "^0.55.1",
-    "next": "^15.2.0",
+    "next": "^16.1.6",
     "node-machine-id": "^1.1.12",
-    "open": "^10.1.0",
-    "ora": "^5.4.1",
-    "react": "19.2.1",
-    "react-dom": "19.2.1",
-    "socks-proxy-agent": "^8.0.4",
-    "undici": "^7.16.0",
+    "open": "^11.0.0",
+    "ora": "^9.1.0",
+    "react": "19.2.4",
+    "react-dom": "19.2.4",
+    "socks-proxy-agent": "^8.0.5",
+    "undici": "^7.19.2",
     "uuid": "^13.0.0",
-    "zustand": "^5.0.9"
+    "zustand": "^5.0.10"
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4.1.18",
     "eslint": "^9",
-    "eslint-config-next": "16.0.10",
+    "eslint-config-next": "16.1.6",
     "tailwindcss": "^4"
   }
 }

src/app/(dashboard)/dashboard/endpoint/EndpointPageClient.js

@@ -19,7 +19,7 @@ export default function APIPageClient({ machineId }) {
   const [showCloudModal, setShowCloudModal] = useState(false);
   const [showDisableModal, setShowDisableModal] = useState(false);
   const [cloudSyncing, setCloudSyncing] = useState(false);
-  const [setCloudStatus] = useState(null);
+  const [cloudStatus, setCloudStatus] = useState(null);
   const [syncStep, setSyncStep] = useState(""); // "syncing" | "verifying" | "disabling" | ""
 
   const { copied, copy } = useCopyToClipboard();

src/proxy.js

@@ -5,7 +5,7 @@ const SECRET = new TextEncoder().encode(
   process.env.JWT_SECRET || "9router-default-secret-change-me"
 );
 
-export async function middleware(request) {
+export async function proxy(request) {
   const { pathname } = request.nextUrl;
 
   // Protect all dashboard routes