From 0c34e31881129520b97647903f06ba682b2fc84b Mon Sep 17 00:00:00 2001
From: shaw <shaw-wei@foxmail.com>
Date: Tue, 19 May 2026 15:10:24 +0800
Subject: [PATCH] =?UTF-8?q?fix(gemini):=20=E4=BF=AE=E5=A4=8D=20chat=20comp?=
 =?UTF-8?q?letions=20compat=20=E7=BC=96=E8=AF=91=E5=A4=B1=E8=B4=A5?=
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PR #2451 引入的 gemini_chat_completions_compat_service.go 调用了
已被 4840194b 删除的 extractImageSize 方法，导致 main 分支自合并
后无法编译，连带 test/golangci-lint/govulncheck 三个 CI 全部失败。

按照 gemini_messages_compat_service.go 的现行模式，改用
extractImageInputSize + normalizeOpenAIImageSizeTier 两步调用，
并补齐 ForwardResult.ImageInputSize 字段以保持行为一致。
---
 .../service/gemini_chat_completions_compat_service.go         | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/backend/internal/service/gemini_chat_completions_compat_service.go b/backend/internal/service/gemini_chat_completions_compat_service.go
index 595bb0bb..5ea02df5 100644
--- a/backend/internal/service/gemini_chat_completions_compat_service.go
+++ b/backend/internal/service/gemini_chat_completions_compat_service.go
@@ -266,7 +266,8 @@ func (s *GeminiMessagesCompatService) forwardClaudeBodyAsChatCompletions(
 	}
 
 	imageCount := 0
-	imageSize := s.extractImageSize(claudeBody)
+	imageInputSize := s.extractImageInputSize(claudeBody)
+	imageSize := normalizeOpenAIImageSizeTier(imageInputSize)
 	if isImageGenerationModel(originalModel) {
 		imageCount = 1
 	}
@@ -282,6 +283,7 @@ func (s *GeminiMessagesCompatService) forwardClaudeBodyAsChatCompletions(
 		ReasoningEffort:  reasoningEffort,
 		ImageCount:       imageCount,
 		ImageSize:        imageSize,
+		ImageInputSize:   imageInputSize,
 		ClientDisconnect: false,
 	}, nil
 }