From 0b31cc209eb2e679df246dcd772a38f8424026ab Mon Sep 17 00:00:00 2001
From: Sakurasan <26715255+Sakurasan@users.noreply.github.com>
Date: Thu, 27 Aug 2026 09:57:48 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20chat=E2=86=92responses=20=E8=BD=AC?=
 =?UTF-8?q?=E6=8D=A2=20input=20=E5=A7=8B=E7=BB=88=E8=BE=93=E5=87=BA?=
 =?UTF-8?q?=E6=95=B0=E7=BB=84?=
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单条消息时原逻辑把 input 塌缩成单个对象，火山方舟等上游只接受
[]*InputItem 数组，直接 400（Mismatch type）。chat/messages 经
vole 渠道转换因此全挂。改为恒为数组，三种协议全矩阵实测恢复。
---
 server/internal/proxy/convert/json_responses.go | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/server/internal/proxy/convert/json_responses.go b/server/internal/proxy/convert/json_responses.go
index 2c12c87..abaf567 100644
--- a/server/internal/proxy/convert/json_responses.go
+++ b/server/internal/proxy/convert/json_responses.go
@@ -240,11 +240,9 @@ func chatToResponsesReq(body []byte) ([]byte, error) {
 	if len(system) > 0 {
 		out["instructions"] = strings.Join(system, "\n")
 	}
-	if len(input) == 1 {
-		out["input"] = input[0] // 单条消息项
-	} else {
-		out["input"] = input
-	}
+	// input 必须是数组：部分上游（如火山方舟）只接受 []*InputItem，
+	// 单对象会被拒（400 Mismatch type）。
+	out["input"] = input
 
 	if len(req.Tools) > 0 {
 		tools := make([]any, 0, len(req.Tools))