Implement oracle keypair management (env/secrets)

[Otaiki1]

Context

The oracle signs reveal transactions with a dedicated keypair. This key must be stored securely (env or secrets manager) and loaded at runtime without logging.

Goal

• Implement KeyService that provides the oracle keypair: load from env (e.g. ORACLE_SECRET_KEY) or from a secrets manager (e.g. AWS Secrets Manager, HSM) for production.
• Expose getKeypair() or getPublicKey()/sign() for use by VrfService and TxSubmitterService.
• Never log or expose the secret; validate at startup that key is present and valid.

Contributor guide

1. Directory: oracle/
2. Add src/keys/key.service.ts. Parse secret key from env; construct Keypair (Stellar SDK). For production, add an adapter for secrets manager and use that when configured.
3. Inject KeyService into VrfService and TxSubmitterService.
4. Document env var and optional production setup in README.

References

• ARCHITECTURE.md — Key security; keys module.

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[llinsss]

hi maintainer. please assign this issue to me

[dimka90]

@dimka90 has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

I am an experience open contributor with vast year in contributing to open source projects, i would like to work on this issue

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