docs: update NetObserv and Kube-OVN networking guidance

[zhangzujian]

Summary

• clarify ClickHouse configuration and password guidance for NetObserv operator deployment
• add Kube-OVN NetworkAttachmentDefinition naming and subnet reuse constraints for multi-network and Egress Gateway usage
• document Egress Gateway bandwidth limits and validated BFD capacity guidance

Verification

• PATH="$PWD/node_modules/.bin:$PATH" yarn lint

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 99b1ae93-b08d-44fb-ab62-2003c672199e

📥 Commits

Reviewing files that changed from the base of the PR and between 3b81fbd and 585fd43.

📒 Files selected for processing (2)

• docs/en/networking/how_to/kube_ovn/configure_egress_gateway.mdx
• docs/en/networking/observability/operator-deployment.mdx

✅ Files skipped from review due to trivial changes (1)

• docs/en/networking/how_to/kube_ovn/configure_egress_gateway.mdx

🚧 Files skipped from review as they are similar to previous changes (1)

• docs/en/networking/observability/operator-deployment.mdx

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Walkthrough

This PR updates ClickHouseInstallation documentation to move system log disabling into a dedicated config file and expand authentication setup guidance. It also adds a new validated capacity guidance section for BFD-based Kube-OVN egress gateway scaling.

Changes

ClickHouseInstallation Configuration and Authentication

Layer / File(s)

Summary

Configuration File and Password Authentication Setup docs/en/networking/observability/operator-deployment.mdx

YAML example restructured to use file-based 99-disable-system-logs.xml configuration instead of inline log disabling; callout marker added for password hash reference; new callouts explain the config file purpose and provide SHA-256 password hash generation instructions; ck-auth.env example updated to use username=clickhouse_root and password=<PLAINTEXT_PASSWORD> with guidance for consistent username substitution.

BFD Validated Capacity Guidance

Layer / File(s)	Summary
Validated BFD Capacity Guidance Section docs/en/networking/how_to/kube_ovn/configure_egress_gateway.mdx	New "Validated Capacity Guidance" section documents BFD interval/multiplier configurations validated with ACP 4.3.2 and Kube-OVN v1.15.13, including a table mapping BFD settings to gateway and Pod scale ranges plus dedicated-node capacity guidance.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 A config file blooms where logs used to stay,
With hashes and secrets now shown the right way.
Then BFD scales upward, capacity in sight,
Hop-hop, docs updated, all neat and bright!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title is broad, but it accurately reflects that the PR updates networking documentation guidance.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[fanzy618]

/ok-to-test