Centralize API configuration and eliminate environment drift across frontend calls

[grantfox-oss]

Standardize API base resolution and runtime config to prevent mismatches between demo, local, and production requests, especially for profile and marketplace flows.

• Affected files: app/frontend/src/lib/api.ts, app/frontend/src/app/page.tsx, app/frontend/src/app/[username]/page.tsx, app/frontend/src/hooks/providers/productionMarketplaceProvider.ts, app/frontend/src/hooks/providers/productionRealtimeProvider.ts, app/frontend/src/hooks/marketplaceApi.ts, app/frontend/src/hooks/analyticsApi.ts, app/frontend/src/app/layout.tsx, app/frontend/src/app/pay/page.tsx
• Acceptance criteria:
  • A single source of truth resolves backend and wallet endpoints consistently across environments.
  • Runtime requests fail with a clear error and safe fallback when the API base is misconfigured.
  • Browser and SSR code paths avoid mismatched fetch behavior and stale env assumptions.

[coderolisa]

Hello Maintainer,

I'd like to work on this issue. I've reviewed the requirements and can complete the implementation as specified.

Please assign it to me. Thank you!

[grantfox-oss]

🦊 GrantFox — @coderolisa has been assigned to this issue as part of the Third Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #523)
2. Your PR will be reviewed by the BlockDash-Studios maintainers

Good luck! Track your progress on GrantFox.

[somotochukwu-dev]

Hi
Please assign this issue to me
I would really like to work on this issue
Thanks

[MaryammAli]

@coderolisa
what is the update on this issue