api: add test — `GET /assets/:id` returns 404 for an unknown asset id

[valoryyaa-byte]

Type: Test coverage

Location: api/src/routes/assets.rs

What's missing
Assert the status is 404 and the body is the documented error shape, not an empty 200.

How to add it
Use the existing routes::test_support::state_with helper to build an
AppState from a fixed Snapshot, call the handler directly, and assert on
the serialized body. Follow the patterns already in api/tests/api_responses.rs.

[pchieneye]

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

I have reviewed this issue and understand the requirements.

I'd be happy to work on it. Please assign it to me.

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

[gregthelma8-eng]

@gregthelma8-eng has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

hi maintainer i would love to be asigned to this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @gregthelma8-eng to this issue.

[drips-wave]

Congratulations, @gregthelma8-eng! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

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