Publish-recommended-node-operator-setup-guide

[Habibah371]

docs(oracle): Publish Recommended Node-Operator Setup Guide

Summary

This PR adds a new documentation file, docs/oracle-node-operator-guide.md, to provide comprehensive guidance for oracle node operators running PropChain oracle infrastructure.

Changes

• Added recommended hardware specifications for oracle operator nodes.
• Documented network connectivity requirements and best practices.
• Included monitoring and alerting recommendations to improve node reliability and uptime.
• Added a step-by-step upgrade procedure to help operators safely update their nodes with minimal service disruption.
• Provided operational guidelines to support consistent and secure oracle node deployment.

Motivation

Oracle nodes play a critical role in maintaining accurate and reliable data feeds across the network. This guide helps node operators establish standardized deployment practices, improve operational resilience, and reduce the risk of downtime caused by misconfiguration or improper maintenance.

Impact

• Improves onboarding experience for new oracle operators.
• Promotes consistent infrastructure standards across the oracle network.
• Enhances node reliability, observability, and maintainability.
• Reduces operational risks during upgrades and routine maintenance.

Testing

Documentation-only change. No code modifications or functional changes were introduced.
Closes #578

[nanaf6203-bit]

🤔 The PR title says "Publish-recommended-node-operator-setup-guide" but the diff is a refactor of indexer/src/poller.rs and indexer/src/ws.rs. Could you confirm the intent, or split into two PRs (the doc + the indexer refactor)? For now this also conflicts with #694 in those same files. Requesting changes until one of those is resolved.