feat: add registry config, image upload/download, and OCI format support
Backend: - Add registry_address configuration API (GET/POST) - Add tar image upload with OCI and Docker format support - Add image download with streaming optimization - Fix blob download using c.Send (Fiber v3 SendStream bug) - Add registry_address prefix stripping for all OCI v2 endpoints - Add AGENTS.md for project documentation Frontend: - Add settings store with Snackbar notifications - Add image upload dialog with progress bar - Add download state tracking with multi-stage feedback - Replace alert() with MUI Snackbar messages - Display image names without registry_address prefix 🤖 Generated with [Qoder](https://qoder.com)
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