fix: correct invalid PromQL in ContainerHighMemory alert rule

Cannot use comparison operators inside label matchers {}.
Move the > 0 filter outside braces as a scalar filter on the
denominator — idiomatic Prometheus way to exclude unlimited containers.

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

roles/services/templates/prometheus/rules/alerts.yml.j2

@@ -68,7 +68,7 @@ groups:
           description: "Контейнер не отвечает более 2 минут."
 
       - alert: ContainerHighMemory
-        expr: (container_memory_usage_bytes{name=~".+"} / container_spec_memory_limit_bytes{name=~".+", container_spec_memory_limit_bytes > 0}) * 100 > 90
+        expr: (container_memory_usage_bytes{name=~".+"} / (container_spec_memory_limit_bytes{name=~".+"} > 0)) * 100 > 90
         for: 5m
         labels:
           severity: warning