www/angie-module-vod: New upstream, update to 1.8.1

This patch changes the port to the new upstream repo, since the
original one the angie documentation still refers to in some places
has been abandoned since 2024.

BEFORE UPDATING:
Carefully read the changelogs at
https://github.com/dio-az/nginx-vod-module/releases,
especially regarding these BREAKING CHANGES in v1.0.0:

• Drop support for HDS and MSS
• Improve compliance with DASH specification
• Use last audio track assuming higher bitrate

PR: 296274
Sponsored by: UNIS Labs
Co-authored-by: Vladimir Druzenko <vvd@FreeBSD.org>
MFH: 2026Q2