Add /api/tournaments endpoints

[josephchimebuka]

Summary

Design and implement tournament listing, detail, and entry endpoints.

Why this matters

Product roadmap includes competitive tournament modes beyond standard rounds.

Where to work

New src/routes/tournaments.ts, data model (mock then DB).

What to implement

Define REST contract with frontend; stub data first; document on-chain linkage.

Acceptance criteria

• List + detail endpoints documented and tested.
• OpenAPI/README updated.

Done when

Frontend can build tournament screens against stable API contracts.

Metadata

Field	Value
Phase	Implementation
Difficulty	intermediate

[444notdotun]

i would love to work on this project

[EmmaxNuel]

I am interest in working on this project

[0xDeon]

Good day Team, My name is Deon, I am a SWE with ample experience building scalable apps and I'd be interested in working on this. I'll define and implement the tournament API contract, including listing, detail, and entry endpoints, starting with a clean mock-backed model that can be extended to persistent storage later.

I'll also add tests, update the API documentation/OpenAPI specs, and document the expected on-chain integration points so the frontend can build against stable tournament endpoints right away.

[Amas-01]

@Amas-01 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello Maintainer
I'll like to work on this Issue. Please Assign me

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

[Danto1606]

@Danto1606 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I would like to work on this

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Danto1606 to this issue.