fix(vision): propagate mtmd media marker from backend via ModelMetadata#9412
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fix(vision): propagate mtmd media marker from backend via ModelMetadata#9412
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Upstream llama.cpp (PR #21962) switched the server-side mtmd media marker to a random per-server string and removed the legacy "<__media__>" backward-compat replacement in mtmd_tokenizer. The Go layer still emitted the hardcoded "<__media__>", so on the non-tokenizer-template path the prompt arrived with a marker mtmd did not recognize and tokenization failed with "number of bitmaps (1) does not match number of markers (0)". Report the active media marker via ModelMetadataResponse.media_marker and substitute the sentinel "<__media__>" with it right before the gRPC call, after the backend has been loaded and probed. Also skip the Go-side multimodal templating entirely when UseTokenizerTemplate is true — llama.cpp's oaicompat_chat_params_parse already injects its own marker and StringContent is unused in that path. Backends that do not expose the field keep the legacy "<__media__>" behavior.
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Upstream llama.cpp (PR #21962) switched the server-side mtmd media marker to a random per-server string and removed the legacy "<media>" backward-compat replacement in mtmd_tokenizer. The Go layer still emitted the hardcoded "<media>", so on the non-tokenizer-template path the prompt arrived with a marker mtmd did not recognize and tokenization failed with "number of bitmaps (1) does not match number of markers (0)".
Report the active media marker via ModelMetadataResponse.media_marker and substitute the sentinel "<media>" with it right before the gRPC call, after the backend has been loaded and probed. Also skip the Go-side multimodal templating entirely when UseTokenizerTemplate is true — llama.cpp's oaicompat_chat_params_parse already injects its own marker and StringContent is unused in that path. Backends that do not expose the field keep the legacy "<media>" behavior.