Add Matrix homeserver with MatrixRTC calling support

- Synapse + PostgreSQL + coturn + LiveKit + lk-jwt-service
- Caddy entries for mtx.alogins.net, lk.alogins.net, lkjwt.alogins.net
- well-known endpoints for Matrix client/server discovery and RTC transport
- Users: admin, elizaveta, aleksandra

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

matrix/coturn/turnserver.conf

@@ -0,0 +1,18 @@
+listening-port=3478
+tls-listening-port=5349
+
+external-ip=83.99.190.32/192.168.1.3
+
+realm=mtx.alogins.net
+server-name=mtx.alogins.net
+
+use-auth-secret
+static-auth-secret=144152cc09030796a4fd0109437dfc2089db2d5181b848d38d20c646c1d7a14b
+
+no-multicast-peers
+denied-peer-ip=10.0.0.0-10.255.255.255
+denied-peer-ip=172.16.0.0-172.31.255.255
+denied-peer-ip=192.168.0.0-192.168.255.255
+
+log-file=stdout
+no-software-attribute