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.

model/channel.go

@@ -292,19 +292,20 @@ func (channel *Channel) Delete() error {
 }
 
 var channelStatusLock sync.Mutex
+
 func UpdateChannelStatusById(id int, status int, reason string) {
-	if (common.MemoryCacheEnabled) {
+	if common.MemoryCacheEnabled {
 		channelStatusLock.Lock()
-		channelCache, err := CacheGetChannel(id)
-		// 如果缓存渠道存在，且状态已是目标状态，直接返回 
-		if channelCache != nil && channelCache.Status == status {  
+		channelCache, _ := CacheGetChannel(id)
+		// 如果缓存渠道存在，且状态已是目标状态，直接返回
+		if channelCache != nil && channelCache.Status == status {
 			channelStatusLock.Unlock()
-			return 
+			return
 		}
-		// 如果缓存渠道不存在(说明已经被禁用)，且要设置的状态不为启用，直接返回 
-		if channelCache == nil && status != common.ChannelStatusEnabled {  
+		// 如果缓存渠道不存在(说明已经被禁用)，且要设置的状态不为启用，直接返回
+		if channelCache == nil && status != common.ChannelStatusEnabled {
 			channelStatusLock.Unlock()
-			return 
+			return
 		}
 		CacheUpdateChannelStatus(id, status)
 		channelStatusLock.Unlock()