Replace the github.com/spf13/afero dependency with a purpose-built
FileStorage interface (Open, Write, Stat, Remove, MkdirAll) with three
implementations: localStorage (with basePath), s3Storage (with key
prefix), and memStorage (for tests).
Each implementation owns its base path — callers pass only file IDs.
Delete s3fs.go, change File.File from afero.File to io.ReadCloser,
and fix duplication flows to buffer content for seeking.
Add a CLI command that finds all files in the database with no MIME type
set, detects it from the stored file content, and updates the database.
This is useful for backfilling MIME types on files created before MIME
detection was added on upload.
kolaente
kolaente