添加完整项目文件

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Co-Authored-By: Claude <noreply@anthropic.com>

constant/api_type.go

@@ -0,0 +1,35 @@
+package constant
+
+const (
+	APITypeOpenAI = iota
+	APITypeAnthropic
+	APITypePaLM
+	APITypeBaidu
+	APITypeZhipu
+	APITypeAli
+	APITypeXunfei
+	APITypeAIProxyLibrary
+	APITypeTencent
+	APITypeGemini
+	APITypeZhipuV4
+	APITypeOllama
+	APITypePerplexity
+	APITypeAws
+	APITypeCohere
+	APITypeDify
+	APITypeJina
+	APITypeCloudflare
+	APITypeSiliconFlow
+	APITypeVertexAi
+	APITypeMistral
+	APITypeDeepSeek
+	APITypeMokaAI
+	APITypeVolcEngine
+	APITypeBaiduV2
+	APITypeOpenRouter
+	APITypeXinference
+	APITypeXai
+	APITypeCoze
+	APITypeJimeng
+	APITypeDummy // this one is only for count, do not add any channel after this
+)