docs(nodes): update BP and node guides for post-Savanna finality

[TheJudii]

Summary

• replace the legacy Leap-era BP installation, requirements, and setup guidance with a TelosZero Core post-Savanna runbook
• add an end-to-end finalizer operations guide covering BLS key creation, registration, policy and vote verification, relays, backups, rotation, failover, recovery, and decommissioning
• document the safety boundary around unique BLS keys and persistent, host-local safety.dat
• update node-role, nodeos, consensus, API, SHiP, and exchange guidance to assume instant finality is already active
• remove or warn against obsolete and unsafe configuration such as chain-id, history_plugin, stale production, wildcard CORS, and public producer services
• link the operator documentation to the maintained telosnetwork/node-template profiles and tooling

Why

The existing documentation mixed older Leap and pre-Savanna instructions with the current TelosZero operating model. It did not provide BPs with the finalizer configuration and lifecycle procedures required after instant finality activation.

A producer is not operationally ready without a correctly configured BLS key, durable safety state, vote-capable relay paths, and verified on-chain policy and voting status.

Impact

BPs now have a complete steady-state setup and recovery path for block production and finalizer voting. Non-producing operators get distinct relay, read-only API, and SHiP guidance without unnecessary signing keys.

This changes documentation only; it does not change chain or application behavior.

Validation

• full Docusaurus production build
• git diff --check
• manual review of internal routes, configuration examples, role boundaries, and node-template integration

The production build succeeds with existing broken-link and broken-anchor warnings on unrelated EVM, quickstart, TEVMC, and wallet pages. None are introduced by this PR.

Dependency

Merge telosnetwork/node-template#36 first, or alongside this PR, because these guides reference its new profiles, renderer, peer tooling, and systemd service.

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