Beta 25

Same content as Beta 24, plus working release binaries.

Release pipeline

• Publishing a release now triggers the build workflow (previously only draft creation did, so Beta 24 shipped with no binaries).
• The fvp video SDK is fetched from a pinned GitHub release instead of SourceForge, which is currently outage-prone.

What's Changed

• Beta 24 content: crash reporting, credential redaction, substream switching, desktop safe-mode, Flutter/video-backend upgrades — see https://github.com/bluecherrydvr/unity/releases/tag/v3.0.0-beta24
• Release binaries: trigger on publish, reliable MDK source by @curtishall in #362