forbes-0023 b531617e39 feat(storage): define FileStore interface and refactor to use it ...

Extract a FileStore interface from the concrete *storage.Storage MinIO
wrapper so the API layer is storage-backend agnostic.

- Define FileStore interface in internal/storage/interface.go
- Add Exists method to MinIO Storage (via StatObject)
- Add compile-time interface satisfaction check
- Change Server.storage and ServerState.storage to FileStore interface
- Update NewServer and NewServerState signatures
- Add Backend and FilesystemConfig fields to StorageConfig
- Add backend selection switch in main.go (minio/filesystem/unknown)
- Update config.example.yaml with backend field

The nil-interface pattern is preserved: when storage is unconfigured,
store remains a true nil FileStore (not a typed nil pointer), so all
existing if s.storage == nil checks continue to work correctly.

Closes #126

2026-02-17 11:49:35 -06:00

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