Issue 41: starforge config doctor — validate config and connectivity

[Nanle-code]

Labels: enhancement, developer-experience

Description:
New command checks TOML schema, wallet key format, Horizon/Soroban reachability, and stellar CLI presence.

Acceptance criteria:

Exit code non-zero on failures.
Uses config validators in src/utils/config.rs.
Files:

New: src/commands/doctor.rs (or extend info.rs)
src/commands/mod.rs
src/main.rs
src/utils/config.rs
src/utils/horizon.rs

[broda-spendy]

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

Hi, I am a software developer and I would love to fix this issue.

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

[drips-wave]

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

🧑‍💻 @broda-spendy: 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 🌊