fix(httputil): rename error body field platformCode → platform_code (#2)
errorBody() map key corrected from "platformCode" to "platform_code" to match the OpenAPI spec snake_case convention. All HTTP error responses produced by Error(w, err) now emit "platform_code" in the JSON body. PR.md added to .gitignore. Depends on xerrors v1.0.2 (go.mod bumped in follow-up commit after xerrors tag). Reviewed-on: #2 Co-authored-by: Rene Nochebuena Guerrero <rene@nochebuena.dev> Co-committed-by: Rene Nochebuena Guerrero <rene@nochebuena.dev>
This commit was merged in pull request #2.
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