UPSTREAM PR #18486: server: /v1/responses (partial)#759

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upstream-PR18486-branch_openingnow-v1_responses

Commits on Jan 20, 2026

from previous PR
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Make instruction(system) as first message
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Convert [input_message] (text/image/file)
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Rename convert_responses_to_chatcmpl(body) -> response_body
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Initial tool call support
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Erase instructions field from chatcmpl body
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Feed reasoning texts to chat template
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Use std::vector instead of opaque json array
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Make output_item.added events consistent
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Move `server_task_result_cmpl_partial::update` from header to source
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Match ID of output_item.added and .done events
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Add function_call only if there is no "fc_" prefix
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Add function call output at non-streaming API
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Test if ID is persistent
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Add doc
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Fix style - use trailing comma
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Rewrite state management
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catch up with upstream/master
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Fix style - "type" is the first item of SSE data
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Explicitly check "instructions" from response_body
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Make lambdas static
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Check if reasoning content exists
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Add `oai_resp_id` to task_result_state(also initialized at ctor), server_task_result_cmpl_partial, and server_task_result_cmpl_final
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