feat(infra): redesign Grafana dashboards, consolidate to single Prometheus
Replace 11 overlapping legacy dashboards with 5 focused dashboards:
- Operations Cockpit (services, Argo CI/CD, resources, auth)
- Trading & ML Intelligence (signals, execution, risk, gRPC)
- Training & CI/CD (training curves, GPU, hyperopt, Argo pipelines)
- Infrastructure & Cluster (nodes, pods, storage, network)
- Observability & API Gateway (logs/Loki, traces/Tempo, API metrics)
Remove gitlab-prometheus-server dependency — single Prometheus instance
with all scrape configs including Argo Workflows (HTTPS + skip verify).
Update Grafana datasource and import.sh for new dashboard structure.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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