Option to automatically add the "/download/ to right lcick context menu

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## Feature request

**Which Nextcloud Version are you currently using:** (see administration page)
34.0.1

**Describe the solution you'd like**
I'd like an option to generate share links with the "/download" added (to force a download, not open the file in the browser).
Either with an option in the config to enable globaly or preferably an additional entry in the right click context menu next to the normal share link.

The issue names no files, tests, or entry points. Start by locating the desktop client's file-sharing and right-click context-menu implementation, then trace how normal share links are generated; done means an additional context-menu option produces a link with "/download" while preserving the existing share-link action.

Written by the indexing model from the issue text.