Add Staging Environment Smoke Test Job Before Production Release Workflows

[maugauwi-hash]

Area: Infrastructure & CI/CD
Priority: Medium
Estimated Time: 2.5 hours

Description:
CI workflows (android-ci.yml, ios-ci.yml) appear focused on build/test/lint. There's no
apparent smoke-test job hitting a staging API_BASE_URL before a release build is cut, which would
catch a backend/client contract mismatch (e.g., a shared/api-contract.md field rename) before it
reaches users.

Tasks:

• Add a smoke-test job running core flows (auth, list vaults, check-in) against a staging environment
• Gate release workflows on this job passing
• Document the staging environment's relationship to API_BASE_URL configuration in README.md

[dunnidev]

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

Hello Maintainer, i can fix this issue

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[devv-leo]

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

I can work on this right away!

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[rudeus112266]

@rudeus112266 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Kindly assign

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[drips-wave]

Congratulations, @rudeus112266! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @rudeus112266: 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.

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@rudeus112266's PR #365 was approved and merged by @maugauwi-hash.

🏆 @rudeus112266: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (118 total points). Track your full progress on GrantFox.

👏 Great work, @rudeus112266! Keep contributing to ethos-protocol.