Oracle: create typed runtime config module

[Otaiki1]

Build location

Work primarily in oracle/src/config. Keep related tests/docs beside that package unless this issue explicitly calls for a cross-package update.

Why this matters

Oracle configuration spans keys, subscribers, submitters, queues, and network settings and needs one typed validation boundary.

What to build

• Add or consolidate config schema for Stellar RPC/Horizon, contract IDs, key providers, queue settings, VRF thresholds, and rescue flags.
• Replace direct process.env reads.
• Document required env vars.

Acceptance criteria

• Tests cover missing secrets, invalid network, and invalid threshold values.
• Startup fails fast with actionable config errors.

Suggested verification

cd oracle && npm run lint && npm run test && npm run build

[Zarmaijemimah]

@Zarmaijemimah has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I’ll love to work on this issue please kindly assign thank you.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Zarmaijemimah to this issue.

[kingjosmel]

@kingjosmel has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I would like to work on this

ℹ️ Repo Maintainers: To accept this application, review their application or assign @kingjosmel to this issue.

[drips-wave]

Congratulations, @Zarmaijemimah! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @Zarmaijemimah: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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