Fix client build for appkit template (#4064)

## Changes
- Fix client build for appkit template

## Why
The path was incorrect:
<img width="1976" height="852" alt="image"
src="https://github.com/user-attachments/assets/f73b87e4-c75c-45aa-a5b3-b4cc79c72fd2"
/>

Co-authored-by: Igor Rekun <[email protected]>

Author: pkosiec

experimental/apps-mcp/templates/appkit/template/{{.project_name}}/client/vite.config.ts

@@ -11,7 +11,7 @@ export default defineConfig({
     middlewareMode: true,
   },
   build: {
-    outDir: path.resolve(__dirname, './client/dist'),
+    outDir: path.resolve(__dirname, './dist'),
     emptyOutDir: true,
   },
   optimizeDeps: {