Local repos store uploaded files in the local_files table, while
remote/proxy repos cache into the artifacts table. The shared "Cached
Objects" page always queried the artifacts table via
/api/v2/remotes/{name}/objects, so local packages (e.g. an uploaded RPM)
were servable but listed as "0 objects" in the UI.
- add ListLocalArtifacts, joining local_files with blobs and returning
models.Artifact-shaped rows (size from the blob; counters zero and
timestamps derived from created_at, since local files track no access)
- add LocalRoutes to the objects handler: listLocal reads local_files,
evictLocal deletes via DeleteLocalFile; extract shared page parsing
into pageBounds
- mount /api/v2/locals/{name}/objects (GET + DELETE) in the server
- add listLocalObjects/evictLocalObject to the UI client and route the
Objects page to them when viewing a local repo
- cover the listing and eviction paths with a dockerised test
