Document all environment variables

[ayshadogo]

User Story:
As a developer, I want all environment variables documented so that new team members can configure the backend correctly.

Acceptance Criteria:

• .env.example with every variable and description
• /docs/environment.md explains each variable's purpose
• Required vs optional clearly marked
• Secrets management advice included

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[Komelove]

@Komelove has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

This issue aligns closely with my experience in contracts, backend architecture, and frontend implementation. I’m keen to work on it and will keep the team informed of my progress along the way.

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

[AbdulSnk]

@AbdulSnk has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi Team,

I am interested in taking on this issue. I have been actively improving my backend development skills and have experience working on real-world projects. I approach tasks methodically, pay attention to details, and am willing to ask questions when clarification is needed.

I would be grateful for the opportunity to contribute and learn while delivering a reliable implementation.

Best regards.

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

[drips-wave]

Congratulations, @AbdulSnk! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @AbdulSnk: 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 🌊

[grantfox-oss]

🦊 GrantFox — @AbdulSnk has been assigned to this issue!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #339)
2. Your PR will be reviewed by the Dfunder maintainers

Good luck! Track your progress on GrantFox.