Bump Flask backend resource limits
## What Increase `monitoring_flask_backend` resources so the Flask API has enough CPU and memory for real customer load. ## Scope - Docker Compose: CPU `0.1` -> `0.5`, memory `192MiB` -> `1024MiB`. - Helm: add explicit Flask resources with CPU request/limit `500m`, memory request `256Mi`, memory limit `1Gi`. ## Validation Covered by !238.
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