feat: removed non-streaming for nextjs

create-app.ts

index.ts

templates/types/simple/nextjs/.env.example

templates/types/simple/nextjs/README-template.md

templates/types/simple/nextjs/app/api/chat/engine/index.ts

templates/types/simple/nextjs/app/api/chat/route.ts

...lates/types/simple/nextjs/app/components/chat-section.tsx

templates/types/simple/nextjs/app/components/header.tsx

...ypes/simple/nextjs/app/components/ui/chat/chat-avatar.tsx

...types/simple/nextjs/app/components/ui/chat/chat-input.tsx

.../types/simple/nextjs/app/components/ui/chat/chat-item.tsx

...es/simple/nextjs/app/components/ui/chat/chat-messages.tsx

...lates/types/simple/nextjs/app/components/ui/chat/index.ts

templates/types/simple/nextjs/app/favicon.ico

templates/types/simple/nextjs/app/globals.css

templates/types/simple/nextjs/app/layout.tsx

templates/types/simple/nextjs/app/page.tsx

templates/types/simple/nextjs/eslintrc.json

templates/types/simple/nextjs/gitignore

templates/types/simple/nextjs/next-env.d.ts