fix: use tcpSocket probe for logto-postgresql instead of pg_isready

pg_isready without -U defaults to OS user "root" which doesn't exist
as a PostgreSQL role, causing noisy log entries.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

deploy/logto.yaml

@@ -59,13 +59,13 @@ spec:
               memory: "512Mi"
               cpu: "500m"
           livenessProbe:
-            exec:
-              command: ["pg_isready"]
+            tcpSocket:
+              port: 5432
             initialDelaySeconds: 15
             periodSeconds: 10
           readinessProbe:
-            exec:
-              command: ["pg_isready"]
+            tcpSocket:
+              port: 5432
             initialDelaySeconds: 5
             periodSeconds: 5
   volumeClaimTemplates: