zenfun cb3b7e8230 feat(api): enrich response envelope metadata ...

Add numeric business codes, include `trace_id`, and support custom
error messages and `details` for error responses while keeping envelope
wrapping idempotent across old and new formats.

BREAKING CHANGE: response envelope `code` changes from string to int and
envelope format now includes `trace_id` (and may include `details`).

2026-01-10 00:33:46 +08:00

7.2 KiB

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