fix: enable local recording when embedded in a same-domain iframe

[RidaElmaaroufi]

Description

This PR enables local recording when Jitsi Meet is embedded in an iframe whose parent is from the same domain.
In this case, the "Start recording" button is now displayed and local recording can be activated as it is considered a trusted embedding context.

Context

Previously, local recording was disabled whenever Jitsi Meet was running inside an iframe, regardless of whether the parent page was from the same domain.
This restriction was overly conservative for same-domain embeddings, where the security constraints of cross-domain iframes do not apply.

This change aligns the behavior with the web security model by allowing local recording in same-origin iframe scenarios, while keeping it disabled for cross-domain embeddings.

Implementation details

• Introduced a same-domain embedding check to distinguish between same-origin and cross-origin iframe usage.
• Updated the local recording capability check to allow recording when embedded in a same-domain iframe.

Testing

• Web: verified that the "Start recording" button is displayed when Jitsi Meet is embedded in a same-domain iframe.
• Web: verified that local recording remains disabled in cross-domain iframe scenarios.

[jitsi-jenkins]

Hi, thanks for your contribution!
If you haven't already done so, could you please make sure you sign our CLA (https://jitsi.org/icla for individuals and https://jitsi.org/ccla for corporations)? We would unfortunately be unable to merge your patch unless we have that piece :(.

[damencho]

Fix the lint errors, please.

[damencho]

Jenkins test this please.

[RidaElmaaroufi]

Could you please merge?