fix(matrix-stack): shorten HelmRelease reconcile interval to 1m

Live-tested Issue #38's rotation: after merging the automated rotation
PR, coturn restarted quickly (Kustomization-level, 1m interval), but
synapse-main lagged behind since it depends on this separate HelmRelease
with its own 5m interval - a real (self-healing, but avoidable) window
where coturn had the new TURN secret and Synapse still had the old one,
which would reject each other's credentials/relayed media. Matching the
interval to production-apps's 1m tightens that window without needing
any new automation.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/production/element-server-suite.yaml

@@ -4,7 +4,11 @@ metadata:
   name: matrix-stack
   namespace: matrix
 spec:
-  interval: 5m
+  # Shortened from 5m to match production-apps Kustomization's 1m interval - narrows the
+  # window between coturn (Kustomization-only, no Helm indirection) and synapse-main
+  # (behind this HelmRelease) picking up a rotated TURN secret after Issue #38's
+  # automated-rotation PR gets merged. Self-heals either way, just faster now.
+  interval: 1m
   chart:
     spec:
       chart: matrix-stack