Allow users to duplicate non-builtin models (chat / embedding / rerank /
VLLM / ASR) from the model card dropdown. The copied model inherits all
parameters (base_url, api_key, provider, embedding params, custom
headers, vision flag, etc.) and gets a non-conflicting name with a
localized suffix, so users can quickly fork and tweak an existing
configuration without re-entering every field.
Adds matching i18n entries (copySuffix / toasts.copied /
toasts.copyFailed / toasts.builtinCannotCopy) for zh-CN, en-US, ko-KR
and ru-RU.
wizardchen
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