feat(media): deploy Element Call fork + optimize LiveKit quality

- Deploy self-hosted Element Call at call.sunbeam.pt with SSO login
- LiveKit: VP9 > AV1 > H.264 codec preferences, Opus stereo
- LiveKit: congestion_control.allow_pause=false, larger NACK buffers
- LiveKit: resources bumped to 2Gi/4CPU for VP9 SVC
- Proxy: add call.* route, TLS cert SAN for call.sunbeam.pt

overlays/production/cert-manager.yaml

@@ -78,3 +78,4 @@ spec:
     - search.DOMAIN_SUFFIX
     - vault.DOMAIN_SUFFIX
     - find.DOMAIN_SUFFIX
+    - call.DOMAIN_SUFFIX