feat(i18n): 系统更新功能多语言支持与缺失 key 补全

- 新增 systemUpdate 区块（zh-CN/zh-TW/en）覆盖系统更新页与版本提示
- zh-CN 补充 account.walletType
- SystemUpdate 页与 Layout 版本 tag 全部改为 useTranslation，移除硬编码中文

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/locales/en/common.json

@@ -419,6 +419,40 @@
       "saveFailed": "Failed to save auto redeem configuration"
     }
   },
+  "systemUpdate": {
+    "title": "System Update",
+    "currentVersion": "Current Version",
+    "ready": "Ready",
+    "hasNewVersion": "New version available: {{version}}",
+    "alreadyLatest": "You are on the latest version",
+    "checkFailed": "Failed to check for updates",
+    "confirmTitle": "Confirm Update",
+    "confirmContent1": "Update to version {{version}}?",
+    "confirmContent2": "The system will be temporarily unavailable during the update (about 30-60 seconds).",
+    "confirmContent3": "The page will refresh automatically when the update completes.",
+    "okText": "Update Now",
+    "cancelText": "Cancel",
+    "updateStarted": "Update started, please wait...",
+    "updateFailedWithMessage": "Update failed: {{message}}",
+    "updateSuccessRefresh": "Update successful! Page will refresh in 3 seconds...",
+    "needAdmin": "Admin permission required to perform update",
+    "startFailed": "Failed to start update",
+    "updating": "System is updating",
+    "updateFailedTitle": "Update Failed",
+    "checkUpdate": "Check for Updates",
+    "newVersionFound": "New Version Available",
+    "publishedAt": "Published At",
+    "releaseNotes": "Release Notes",
+    "upgradeNow": "Upgrade to v{{version}} Now",
+    "usageTitle": "Instructions",
+    "usage1": "Click \"Check for Updates\" to see if a new version is available",
+    "usage2": "Update takes about 30-60 seconds; the system will be temporarily unavailable",
+    "usage3": "The page will refresh automatically after a successful update",
+    "usage4": "If the update fails, the system will roll back to the current version",
+    "versionTooltipNew": "New version available, click to go to System Update",
+    "versionTooltipLatest": "You are on the latest version",
+    "prerelease": "Pre-release"
+  },
   "builderApiKey": {
     "title": "Builder API Key Configuration",
     "alertTitle": "What is Builder API Key?",
@@ -1579,20 +1613,36 @@
       "title": "Price Chart",
       "btcTitle": "BTC Price Chart",
       "marketTitle": "Market Price Chart",
-      "price": "BTC Price",
+      "priceChart": "Price Chart",
+      "price": "Price",
       "openPrice": "Open",
       "spread": "Spread",
       "minSpreadLine": "Min Spread Line",
+      "maxSpreadLine": "Max Spread Line",
       "marketUp": "Up",
       "marketDown": "Down",
-      "time": "Time"
+      "time": "Time",
+      "latestPrice": "Latest",
+      "timeWindowStart": "Window Start",
+      "timeWindowEnd": "Window End"
     },
     "strategyInfo": {
       "title": "Strategy Info",
       "market": "Market",
       "interval": "Interval",
       "account": "Account",
-      "spreadMode": "Spread Mode"
+      "spreadMode": "Spread Mode",
+      "spreadDirection": "Spread Direction"
+    },
+    "periodSwitch": {
+      "mode": "Period Switch Mode",
+      "auto": "Auto",
+      "manual": "Manual",
+      "autoDesc": "Automatically switch to the latest period when it ends",
+      "manualDesc": "Keep complete data when period ends",
+      "switchToLatest": "Switch to Latest Period",
+      "periodEnded": "Current period has ended",
+      "newPeriodAvailable": "New period has started"
     }
   }
 }