feat: 支持设置并在远程订阅失败时读取最近一次成功的缓存

package.json

@@ -1,6 +1,6 @@
 {
   "name": "sub-store-front-end",
-  "version": "2.14.215",
+  "version": "2.14.216",
   "private": true,
   "scripts": {
     "dev": "vite --host",

src/locales/en.ts

@@ -228,7 +228,7 @@ export default {
         },
         url: {
           label: 'URL',
-          placeholder: 'Subscription URL (please separate multiple subscriptions with a new line). Supported parameters: validCheck - error will be reported when expired or there is no remaining traffic, flowUserAgent - the User-Agent for fetching subscription usage info, showRemaining - show remaining traffic instead of usage, noFlow - do not query for flow, hideExpire - hide expiration time, noCache - do not use cache, resetDay - the day when monthly data usage resets, startDate - subscription start date, cycleDays - reset cycle (in days). For example: http://a.com?token=1#cycleDays=31&startDate=2024-06-04 or http://a.com?token=1#resetDay=15',
+          placeholder: 'Subscription URL (please separate multiple subscriptions with a new line). Supported parameters: cacheKey - Read the last successful cache from here when the request fails,validCheck - error will be reported when expired or there is no remaining traffic, flowUserAgent - the User-Agent for fetching subscription usage info, showRemaining - show remaining traffic instead of usage, noFlow - do not query for flow, hideExpire - hide expiration time, noCache - do not use cache, resetDay - the day when monthly data usage resets, startDate - subscription start date, cycleDays - reset cycle (in days). For example: http://a.com?token=1#cycleDays=31&startDate=2024-06-04 or http://a.com?token=1#resetDay=15',
           isEmpty: 'URL cannot be empty',
           isIllegal: 'Invalid URL',
         },

src/locales/zh.ts

@@ -228,7 +228,7 @@ export default {
         },
         url: {
           label: '链接',
-          placeholder: '订阅链接(多个订阅请换行) 支持参数: validCheck 过期或无剩余流量时报错, flowUserAgent 查询流量时使用的 User-Agent, noFlow 不查询流量, hideExpire 隐藏到期, showRemaining 显示剩余流量而不是已用流量, noCache 不使用缓存, resetDay 每月流量重置日, startDate 订阅开始日期, cycleDays 订阅重置周期(单位: 天). 例: http://a.com?token=1#cycleDays=31&startDate=2024-06-04 或 http://a.com?token=1#resetDay=15',
+          placeholder: '订阅链接(多个订阅请换行) 支持参数: cacheKey 请求失败时从此处读取最近一次成功的缓存, validCheck 过期或无剩余流量时报错, flowUserAgent 查询流量时使用的 User-Agent, noFlow 不查询流量, hideExpire 隐藏到期, showRemaining 显示剩余流量而不是已用流量, noCache 不使用缓存, resetDay 每月流量重置日, startDate 订阅开始日期, cycleDays 订阅重置周期(单位: 天). 例: http://a.com?token=1#cycleDays=31&startDate=2024-06-04 或 http://a.com?token=1#resetDay=15',
           isEmpty: '订阅链接不能为空',
           isIllegal: '订阅链接格式非法',
         },