admin-ui: stop logging raw AxiosError (api-token) on list/delete failures #96

Context

Follow-up from the #95 review (non-blocking P2), not a regression of that PR. The preset-save failure path added in #95 logs only a bounded message; this issue covers older admin-ui call sites that still log a raw AxiosError.

Verified facts

admin-ui/src/utils/request.js:68-70 adds the auth token to every request config:

const token = userStore.token || getToken()
if (token) {
  config.headers['api-token'] = token
}

On an HTTP/transport failure axios rejects with an AxiosError that carries config (including that header). These catches log the whole error object:

• admin-ui/src/views/custom-client/index.vue:1501 — loadPresets() catch (custom_preset/list)
• admin-ui/src/views/custom-client/index.vue:1428 — loadBuilds() catch (custom_build/list)
• admin-ui/src/views/custom-client/index.vue:1628 — deleteBuild() catch (custom_build/delete)
• admin-ui/src/views/custom-client/index.vue:1701 — deletePreset() catch (custom_preset/delete)

The response interceptor already toasts a bounded message for these failures, so the raw console log adds no required signal and exposes the token (and potentially request data) in devtools or support screenshots.

Expected behavior

Failed list/delete requests must not log the raw AxiosError/config. Log only a bounded diagnostic (for example e?.message || String(e), consistent with reportCreateBuildFailure at index.vue:1116) or drop the log where the interceptor already surfaced the failure.

Acceptance

• A failing custom_preset/list, custom_build/list, custom_preset/delete, or custom_build/delete request does not print config.headers['api-token'] or request bodies to the console.
• A bounded diagnostic remains for genuinely unexpected failures (or the failure is already fully surfaced by the interceptor).
• No change to user-visible behavior, API contracts, or the admin-ui: surface preset save field errors inline #95 preset-save path.
• If practical, a regression test asserts that the raw config/headers are not passed to console.error.

Scope and constraints

• Admin UI only; no new dependencies.
• Keep this separate from admin-ui: surface preset save field errors inline #95.