## Why
The local-repo object browser renders every file name as inert text, so there is no way to grab a file from the UI even though local rpm repos already serve their contents as real yum repos. Users have to hand-construct URLs. This adds one-click downloads, built as a modular per-repo-type capability so other types can be switched on later with a single map entry.
## Changes
- Adds a `downloadableTypes` capability map (`ui/src/components/downloads.ts`) keyed by `package_type`; each entry builds the direct-download URL for a file.
- Enables `rpm`, pointing at the yum files route `/api/v2/remotes/<repo>/files/<path>` (path-segment-encoded).
- Renders file names in the object browser as `<a href download>` links when the repo's type is downloadable, and as plain text otherwise.
- Fetches the repo's `package_type` on the Objects page as the modularity hook and threads it through the tree rows.
## Notes
Download links are same-origin unauthenticated GETs (the API serves local repos with no token on reads, matching how yum clients fetch), so a bare `href` carries no credentials. Adding a future type is one entry in `downloadableTypes`.
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Co-authored-by: Ben Vin <neotheo@gmail.com>
Reviewed-on: #106
Co-authored-by: Ben Vincent <ben@unkin.net>
Co-committed-by: Ben Vincent <ben@unkin.net>
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