fix: update JSONEditor to default to manual mode for invalid JSON and add error message for invalid data

relay/channel/gemini/relay-gemini-native.go

@@ -108,11 +108,10 @@ func GeminiTextGenerationStreamHandler(c *gin.Context, info *relaycommon.RelayIn
 
 		// 直接发送 GeminiChatResponse 响应
 		err = helper.StringData(c, data)
-		info.SendResponseCount++
 		if err != nil {
 			common.LogError(c, err.Error())
 		}
-
+		info.SendResponseCount++
 		return true
 	})