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.

web/src/i18n/locales/en.json

@@ -797,7 +797,7 @@
   "管理员未开启Stripe在线充值！": "The administrator has not enabled Stripe online recharge!",
   "当前充值1美金=": "Current recharge = 1 USD =",
   "请选择充值方式！": "Please choose a recharge method!",
-  "元": "RMB/CNY",
+  "元": "CNY",
   "充值记录": "Recharge record",
   "返利记录": "Rebate record",
   "确定要充值 $": "Confirm to top up $",
@@ -963,7 +963,7 @@
   "请输入星火大模型版本，注意是接口地址中的版本号，例如：v2[1]": "Please enter the Spark model version, note that it is the version number in the interface address, for example: v2.1",
   "等待中": "Waiting",
   "所有各厂聊天模型请统一使用OpenAI方式请求，支持OpenAI官方库": "Please use the OpenAI method to request all chat models from each factory, and support the OpenAI official library.",
-  "实付金额：": "Actual payment amount:",
+  "实付金额：": "Actual payment amount: ",
   "金额": "Amount",
   "充值金额": "Recharge amount",
   "易支付 实付金额：": "Easy Pay Actual payment amount:",