MOB-47: Backend Base URL Alignment Cleanup

[Cedarich]

Complexity: 150 points
Branch: feat/mobile-base-url-alignment
Summary
Unify backend base URL handling across the mobile app so services stop drifting between outdated localhost ports and environment assumptions.
Tasks

• Audit all service modules for inconsistent base URL defaults.
• Replace hardcoded URLs with one shared environment-aware source.
• Add safe fallback behavior for missing config.
• Add tests for local, preview, and shared testnet environments.
  Acceptance Criteria
• Mobile services resolve backend URLs consistently.
• Old hardcoded port assumptions are removed.
• Local and testnet environments both work predictably.

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[therealmercy-dev]

@therealmercy-dev has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi maintainer! I would love to help you with this issue. Given my theoretical knowledge and background, I am quite sure that I am well-equipped to tackle it. Please kindly assign it to me.

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[MiaShayla]

@MiaShayla has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello, I explored the issue, understand the expected outcome, and have a solid implementation plan. I'd appreciate the opportunity to work on this and contribute a reliable solution.

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[Tonyfash]

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May i quickly work on this?

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[baling-1]

@baling-1 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

GM team! I’d like to work on this issue. I have experience contributing to open source and I’m confident I can deliver a clean, well-tested solution.
ETA: 6 hours.

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[barnabasolutayo-lgtm]

@barnabasolutayo-lgtm has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello maintainer. I can resolve this issue quickly. Please assign to me. Thank you

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[Windowlight]

@Windowlight has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I've reviewed the codebase and identified where the change needs to be made. My approach is to implement the requested functionality while preserving the existing architecture, add tests where appropriate, and ensure all CI checks pass. I'm ready to start immediately

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[Bojest001]

@Bojest001 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi Maintainer please I will like to work on this issue

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