Expose linked component info in the API

[nijel]

Describe the problem

Presently the API hides linked components by exposing real repository URL. This was done to make the repo URL usable outside Weblate, but this also complicates editing of the component as the actual setting is not shown.

Describe the solution you would like

Expose real repo (and related) field with the value as is stored in the database. This can break compatibility if somebody relied on the real URL, but will make the API more consistent.

Additionally, add linked_component read-only field so that the actual repo can be easily obtained.

Describe alternatives you have considered

Adding only linked_component field would allow detecting this is a linked component, without breaking existing repo uses. On the other side, there are other fields which are masked this way what makes editing of the linked component via API really tricky.

Screenshots

No response

Additional context

No response

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