Add cloud storage functionality with Vercel KV integration in studio#70

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Copilot wants to merge 7 commits intomainfrom

copilot/add-cloud-storage-features

Commits on Jan 15, 2026

Initial plan
Copilot
committed
Migrate playground from Vite to Next.js App Router structure

Copilot
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huangyiirene
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Complete Next.js App Router migration and successful build

Copilot
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huangyiirene
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Address code review feedback: improve error handling and documentation

Copilot
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xuyushun441-sys
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Add API routes for cloud design storage with CRUD operations

Copilot
and
xuyushun441-sys
committed
Changes before error encountered

Copilot
and
huangyiirene
committed
Implement Vercel KV integration with fallback to in-memory storage

Copilot
and
xuyushun441-sys
committed