Add Secret Configuration Startup Check

[Abd-Standard]

Description

Detect obviously unsafe secret configuration during startup, such as empty required credentials or development placeholders being used in production mode.

Acceptance Criteria

Required secrets are validated.

Known placeholder values can be detected.

Validation does not print secret values.

Failure messages explain how configuration should be corrected.

[Dami24-hub]

@Dami24-hub has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello Maintainer, this is an amazing project and I will love to work on it.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Dami24-hub to this issue.

[drips-wave]

Congratulations, @Dami24-hub! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @Dami24-hub: 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.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊