- C1-01: Create CloudService with CRUD folders/files, quota, ownership
- C1-02: Create CloudHandler with 11 REST endpoints
- C1-03: Register cloud routes in Go router
- C1-04: Implement file streaming with HTTP Range support
- C1-05: Add publish cloud file as track endpoint
- C1-06: Add MSW mock handlers for cloud API
- C1-07: Auto-init 5GB storage quota on user registration
- C1-08: Add 12 unit tests for CloudService
