docs: add 7ya.io rest-express management baseline

[vepretski]

Motivation

• Capture operational best-practices for the rest-express deployment and translate package-level expectations into a repeatable runtime management baseline.
• Reduce release risk by documenting standard release workflow steps and production guardrails tied to the repository scripts (npm run check, npm run build, npm run start, npm run db:push).
• Provide clear service-boundary, dependency-governance, and incident/runbook guidance for high-risk providers used by 7ya.io.

Description

• Added a new Section 11 to docs/7ya-io-operating-plan.md titled "7ya.io Node/Express Runtime Management Baseline" that targets the rest-express runtime.
• Documented a recommended release workflow that references repository scripts and the expected CI/pipeline behavior for build and deploy artifacts.
• Added 11.1 Service boundaries guidance to isolate auth, realtime, and outbound-communications dependencies behind appropriate tiers and flags.
• Added 11.2 Dependency governance and 11.3 Production controls guidance to enforce version pinning, upgrade review, staged rollouts, health probes, and incident/runbook practices.

Testing

• Ran git diff --check as a validation step and it completed without issues.
• This is a documentation-only change so no application unit/integration tests were required or run in this patch.

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Codex Task