feat: Try H.264 codec for calls instead of VP8

H.264 uses classic simulcast (like VP8), not SVC, so it's compatible
with the fork's simulcast-shaped publish options without needing a
code fix - unlike VP9/AV1 (see the 2026-07-28 incident notes). Also
tends to be hardware-accelerated on more devices, notably iOS/Safari.
Server-side: LiveKit has no codec restriction configured, supports
H.264 by default.

apps/production/element-server-suite.yaml

@@ -74,7 +74,7 @@ spec:
       image:
         registry: rohana.axion1337.de
         repository: sorb/threadnet-web
-        tag: v0.2.2-elementcall-simulcast
+        tag: v0.2.3-elementcall-h264
       ingress:
         host: axion1337.chat