chore(grafana): add proofs-history observability

[panos-xyz]

Summary

• add Proof History, proof RPC, and proof-pruner panels while preserving Morph dashboard filters and documenting batch/success-only metric semantics
• selectively sync compatible reth v2.4 Engine Tree, state-root worker, ExEx/WAL, payload, pruning, and allocator panels without restoring L1-only or staged-sync views
• fix the example stack's invalid chain name, align its Prometheus network label, and document Hoodi and --proofs-history setup

Test plan

• parse the dashboard with jq
• validate unique panel IDs, 24-column bounds, Morph query filters, datasource placeholder, and excluded metric families
• validate etc/docker-compose.yml with docker compose config --quiet
• launch an isolated mainnet node with Proof History enabled and live-scrape the new metric families
• call both eth_getProof and eth_getMultiProof and verify their labeled Prometheus series
• import the dashboard into the production Grafana environment and tune presentation with real traffic

This is stacked on #142 so the PR contains only the dashboard/configuration changes. Retarget to main after #142 merges.

Closes #168

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