Fix VPS Nextcloud DB connection (PGSSLMODE) and n8n probe timing

Nextcloud: PHP's postgres driver tries to look up a client cert at
$HOME/.postgresql/postgresql.crt (HOME=/root in this image) for
verify-ca/verify-full sslmodes - 'Permission denied' there aborts the
connection entirely with a confusing 'password authentication failed'
secondary error. Confirmed live: psql with the identical credentials
connects fine (uses sslmode=prefer, no cert lookup). PGSSLMODE=disable
sidesteps it - this is an intra-cluster connection, not worth TLS here.

n8n: chart's default liveness/readiness probe timing is tighter than
n8n needs to actually finish starting - kubelet was killing the
container (exitCode 143/SIGTERM) before it ever bound :5678, in an
endless crashloop. Copied home's more generous probe timing.

infrastructure/vps-standby/n8n/values.yaml

@@ -78,6 +78,37 @@ resources:
     cpu: "500m"
     memory: 512Mi
 
+# Chart defaults are more aggressive than n8n needs to actually finish
+# starting - without this the liveness probe kills the container before
+# it ever binds :5678 (confirmed live: exitCode 143/SIGTERM, crashloop).
+# Matches home's apps/n8n/values.yaml timings.
+startupProbe:
+  httpGet:
+    path: /healthz
+    port: http
+  initialDelaySeconds: 10
+  periodSeconds: 5
+  timeoutSeconds: 3
+  failureThreshold: 12
+
+readinessProbe:
+  httpGet:
+    path: /healthz
+    port: http
+  initialDelaySeconds: 5
+  periodSeconds: 5
+  timeoutSeconds: 3
+  failureThreshold: 2
+
+livenessProbe:
+  httpGet:
+    path: /healthz
+    port: http
+  initialDelaySeconds: 10
+  periodSeconds: 10
+  timeoutSeconds: 5
+  failureThreshold: 3
+
 extraEnvSecrets:
   DB_POSTGRESDB_PASSWORD:
     name: pg-n8n-app