fix: AI route maxDuration (#2466)

## Description

1. Route now is not layout or like `_index`  postfix
2. export const config instead of export const maxDuration



## Steps for reproduction

1. click button
3. expect xyz

## Code Review

- [ ] hi @kof, I need you to do
  - conceptual review (architecture, feature-correctness)
  - detailed review (read every line)
  - test it on preview

## Before requesting a review

- [ ] made a self-review
- [ ] added inline comments where things may be not obvious (the "why",
not "what")

## Before merging

- [ ] tested locally and on preview environment (preview dev login:
5de6)
- [ ] updated [test
cases](https://github.com/webstudio-is/webstudio/blob/main/apps/builder/docs/test-cases.md)
document
- [ ] added tests
- [ ] if any new env variables are added, added them to `.env.example`
and the `builder/env-check.js` if mandatory

apps/builder/app/builder/features/ai/ai-fetch-result.ts

@@ -30,7 +30,7 @@ import {
 } from "~/shared/nano-states";
 import { applyOperations, patchTextInstance } from "./apply-operations";
 import { restAi } from "~/shared/router-utils";
-import { RequestParamsSchema } from "~/routes/rest.ai";
+import { RequestParamsSchema } from "~/routes/rest.ai._index";
 import untruncateJson from "untruncate-json";
 import { traverseTemplate } from "@webstudio-is/jsx-utils";
 

apps/builder/app/builder/features/ai/commands-bar.tsx

@@ -34,7 +34,7 @@ import {
 import { applyOperations, patchTextInstance } from "./apply-operations";
 import { useStore } from "@nanostores/react";
 import { restAi } from "~/shared/router-utils";
-import { RequestParamsSchema } from "~/routes/rest.ai";
+import { RequestParamsSchema } from "~/routes/rest.ai._index";
 import untruncateJson from "untruncate-json";
 import { traverseTemplate } from "@webstudio-is/jsx-utils";
 

apps/builder/app/routes/rest.ai._index.ts

@@ -36,7 +36,9 @@ export const RequestParamsSchema = z.object({
 });
 
 // Override Vercel's default serverless functions timeout.
-export const maxDuration = 180; // seconds
+export const config = {
+  maxDuration: 180, // seconds
+};
 
 export const action = async ({ request }: ActionArgs) => {
   // @todo Reinstate isFeatureEnabled('ai')