agama-project / agama / 21257474000 / 3 – web

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Multiple fixes in the registration page (#3061)

## Problem

The goal of this PR is to bring the registration page to an usable
state, fixing other registration-related problems along the way.

## Solution

Changes in the web UI:

- Allow registering add-ons (gh#agama-project/agama#3061).
- Improve error reporting in the registration page.
- Do not block the UI when registering the system (bsc#1257105).
- Do not allow to change the product when it is already registered.

Changes in the backend:

- Consider inst.register_url as part of the "extended configuration"
(bsc#1256907).
- Try to register the system even if only a registration URL was
specified (without a code).
- When the registration fails, retry it on the next SetConfig call.

## Testing

- Added a new unit test
- Tested manually

## Screenshots

<details>
<summary>Not registered system</summary>

<img width="1514" height="771" alt="Captura desde 2026-01-22 12-16-27"
src="https://github.com/user-attachments/assets/421965fe-bb40-41a2-a7d6-f54f0e320434"
/>
</details>

<details>
<summary>Registration error</summary>

<img width="1509" height="695" alt="Captura desde 2026-01-22 12-16-03"
src="https://github.com/user-attachments/assets/c748f888-3fb9-4da6-9635-5751d11991a9"
/>
</details>


<details>
<summary>Registered system</summary>

<img width="1509" height="695" alt="Captura desde 2026-01-22 12-13-58"
src="https://github.com/user-attachments/assets/633757b6-e093-470a-a46f-60b0f97070c9"
/>

</details>

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