fix: Replace broken netstat liveness probe on coturn with tcpSocket check

coturn started up cleanly every time (all TCP/UDP listeners on 3478/5349
opened fine per logs) but was killed every ~10s because the liveness
probe ran "netstat -uln", which doesn't exist in coturn/coturn:latest
(sh: netstat: not found) - 36000+ restarts over 88 days for a healthy
process. Switched to a tcpSocket probe against the TCP listener coturn
already opens on 3478, no in-container tooling required.

apps/production/coturn.yaml

@@ -130,11 +130,8 @@ spec:
             cpu: 100m
             memory: 128Mi
         livenessProbe:
-          exec:
+          tcpSocket:
-            command:
+            port: 3478
-            - /bin/sh
-            - -c
-            - "netstat -uln | grep 3478 || exit 1"
           initialDelaySeconds: 30
           periodSeconds: 10
       volumes: