feat(studio): deploy manual designer and configurable AI model

app/middleware/design-studio.ts

@@ -1,6 +1,6 @@
 import type { Middleware } from "@wrnexus/core";
 import type { createStudioHandler } from "@wrnexus/design-studio/server";
-import { studioAI } from "../lib/studio-ai.ts";
+import { APIMART_MODEL, studioAI } from "../lib/studio-ai.ts";
 import { addStudioGuide, studioHelpScript } from "../lib/studio-guide.ts";
 import { studioRequest } from "../lib/studio-origin.ts";
 
@@ -17,7 +17,11 @@ const designStudio: Middleware = async (ctx, next) => {
   if (!url.pathname.startsWith("/design-studio/")) return next();
   const request = studioRequest(ctx.req);
   if (request instanceof Response) return request;
-  ai ??= studioAI(process.env.APIMART_API_KEY?.trim());
+  ai ??= studioAI(
+    process.env.APIMART_API_KEY?.trim(),
+    fetch,
+    process.env.APIMART_MODEL?.trim() || APIMART_MODEL,
+  );
   const generated = await ai(request);
   if (generated) return generated;
   if (
@@ -54,6 +58,7 @@ const designStudio: Middleware = async (ctx, next) => {
       addStudioGuide(
         await response.text(),
         !!process.env.APIMART_API_KEY?.trim(),
+        process.env.APIMART_MODEL?.trim() || APIMART_MODEL,
       ),
       { status: response.status, headers },
     );