feat(keda): add path filter to HTTPScaledObject

Filter scales only on inference traffic (/v1/chat/completions):
- Ignores probes (/health, /v1/models)
- targetPendingRequests defaults (low queue → up)
- Keeps scaledownPeriod 900s idle zero

apps/base/customer1/openclaw/keda-a100.yaml

@@ -12,6 +12,8 @@ spec:
     apiVersion: apps/v1
     service: openclaw-brain-service
     port: 8000
+  paths:
+  - path: "^/v1/chat/completions"
   replicas:
     min: 0
     max: 1