v0.40.2-rc0: server: hide duplicate and downgrade guards from list (#18874)

发生了什么

When a legacy GGUF which requires our llama.cpp patch set is loaded, we do a lazy conversion on disk to make it llama.cpp compatible. To support downgrades, we temporarily hold both the new and old GGUFs and create a shadow v1 manifest tag to prevent the downgraded server from deleting the new blobs. Showing these in the list output is confusing to users and API consumers. The legacy copies will be removed in a futu…

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