refactor: Improve channel status update logic and clean up code

- Simplified conditional checks in UpdateChannelStatusById function in channel.go to enhance readability.
- Commented out unused image number check in relay-gemini.go for clarity.
- Updated JSON field in en.json for currency consistency, changing "元" from "RMB/CNY" to "CNY" and added a space in "实付金额：" for formatting.

relay/channel/gemini/relay-gemini.go

@@ -103,9 +103,9 @@ func CovertGemini2OpenAI(textRequest dto.GeneralOpenAIRequest) *GeminiChatReques
 				})
 			} else if part.Type == dto.ContentTypeImageURL {
 				imageNum += 1
-				if imageNum > GeminiVisionMaxImageNum {
-					continue
-				}
+				//if imageNum > GeminiVisionMaxImageNum {
+				//	continue
+				//}
 				// 判断是否是url
 				if strings.HasPrefix(part.ImageUrl.(dto.MessageImageUrl).Url, "http") {
 					// 是url，获取图片的类型和base64编码的数据