Keep MQTT for real-time alerts, add Pacific timezone

Revert webapi change — polling latency is too high for alerts.
MQTT with zone/label filters gives sub-second delivery. Add
TZ=America/Los_Angeles to frigate-notify for local timestamps.

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

argocd/manifests/frigate/deployment-notify.yaml

@@ -17,6 +17,9 @@ spec:
       containers:
         - name: frigate-notify
           image: ghcr.io/0x2142/frigate-notify:v0.3.5
+          env:
+            - name: TZ
+              value: America/Los_Angeles
           volumeMounts:
             - name: config
               mountPath: /app/config.yml