[DOCUMENTATION] Write troubleshooting guide for common setup issues

[dev-fatima-24]

Priority: medium

Description

The docs/TROUBLESHOOTING.md file exists but only covers 3 issues. The most common contributor problems (Rust WASM target missing, Stellar CLI version mismatch, PostgreSQL connection refused, Freighter not detecting testnet) must be documented with step-by-step solutions.

Acceptance Criteria

• At least 15 common issues documented with symptoms, cause, and solution
• Issues organized by component (contracts, backend, frontend, oracle)
• Each issue includes the exact error message to search for
• Solutions are tested and verified to work
• Guide links to relevant official documentation for deeper reading

[Menjay7]

@Menjay7 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi! I’m a full-stack developer with a strong blockchain background. I’d love to handle this issue and can deliver a clean, reliable solution. Kindly assign it to me.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Menjay7 to this issue.

[raphael-01-visual]

@raphael-01-visual has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Can I work on this issue ? ETA - 12hrs

ℹ️ Repo Maintainers: To accept this application, review their application or assign @raphael-01-visual to this issue.

[drips-wave]

Congratulations, @raphael-01-visual! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @raphael-01-visual: 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 🌊