[codex] Show system runbooks

[LioRael]

Summary

• Add service system runbook API types, sample data, query key, and fetch helper.
• Summarize active runbook state for the Services page.
• Show active runbook/current step next to release train state.

Test Plan

• pnpm test -- services-model.test.ts available-modules.test.ts
• pnpm typecheck:local
• pnpm format:check

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Latest commit: efe3164

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