feat: enhance Authorization header handling with Header Override support

relay/channel/openai/adaptor.go

@@ -184,9 +184,25 @@ func (a *Adaptor) SetupRequestHeader(c *gin.Context, header *http.Header, info *
 		header.Set("api-key", info.ApiKey)
 		return nil
 	}
+	// 自定义渠道类型完全跳过默认 Authorization 设置，由 Header Override 控制
+	if info.ChannelType == constant.ChannelTypeCustom {
+		// 自定义渠道不设置默认 Authorization，完全由 Header Override 控制
+		return nil
+	}
 	if info.ChannelType == constant.ChannelTypeOpenAI && "" != info.Organization {
 		header.Set("OpenAI-Organization", info.Organization)
 	}
+	// 检查 Header Override 是否已设置 Authorization，如果已设置则跳过默认设置
+	// 这样可以避免在 Header Override 应用时被覆盖（虽然 Header Override 会在之后应用，但这里作为额外保护）
+	hasAuthOverride := false
+	if len(info.HeadersOverride) > 0 {
+		for k := range info.HeadersOverride {
+			if strings.EqualFold(k, "Authorization") {
+				hasAuthOverride = true
+				break
+			}
+		}
+	}
 	if info.RelayMode == relayconstant.RelayModeRealtime {
 		swp := c.Request.Header.Get("Sec-WebSocket-Protocol")
 		if swp != "" {
@@ -201,10 +217,14 @@ func (a *Adaptor) SetupRequestHeader(c *gin.Context, header *http.Header, info *
 			//req.Header.Set("Sec-Websocket-Version", c.Request.Header.Get("Sec-Websocket-Version"))
 		} else {
 			header.Set("openai-beta", "realtime=v1")
-			header.Set("Authorization", "Bearer "+info.ApiKey)
+			if !hasAuthOverride {
+				header.Set("Authorization", "Bearer "+info.ApiKey)
+			}
 		}
 	} else {
-		header.Set("Authorization", "Bearer "+info.ApiKey)
+		if !hasAuthOverride {
+			header.Set("Authorization", "Bearer "+info.ApiKey)
+		}
 	}
 	if info.ChannelType == constant.ChannelTypeOpenRouter {
 		header.Set("HTTP-Referer", "https://www.newapi.ai")