feat: 完善 Telegram 推送通知功能

- 推送模板优化：
  - 优先使用账户名称而不是钱包地址
  - 使用市场标题而不是16进制ID
  - 添加可点击的市场链接（支持 slug 和 conditionId）
  - 添加市场方向（outcome）显示
  - 数量和价格从订单详情API获取实际值
  - 失败通知只显示后端返回的msg，不显示完整堆栈

- 多语言支持：
  - 后端推送消息支持多语言（使用前端最后请求的语言）
  - 添加所有 ErrorCode 的多语言资源文件（中文简体、繁体、英文）
  - 通知消息文本全部使用多语言资源

- 功能改进：
  - 从订单详情获取实际的 side、price、size、outcome
  - 支持买入/卖出方向的多语言显示
  - 错误信息优化，只显示后端返回的错误消息

frontend/src/locales/en/common.json

@@ -203,6 +203,7 @@
     "language": "Language",
     "apiHealth": "API Health",
     "proxy": "Proxy",
+    "notifications": "Notifications",
     "logout": "Logout",
     "logoutConfirm": "Confirm Logout",
     "logoutConfirmDesc": "Are you sure you want to logout?",
@@ -428,5 +429,75 @@
     "deleteSuccess": "Copy trading deleted successfully",
     "deleteFailed": "Failed to delete copy trading",
     "deleteConfirm": "Are you sure you want to delete this copy trading relationship?"
+  },
+  "notificationSettings": {
+    "title": "Notification Settings",
+    "addConfig": "Add Configuration",
+    "editConfig": "Edit Configuration",
+    "configName": "Configuration Name",
+    "configNamePlaceholder": "e.g., My Telegram Bot",
+    "configNameRequired": "Please enter configuration name",
+    "type": "Notification Type",
+    "typeRequired": "Please select notification type",
+    "enabled": "Enabled Status",
+    "status": "Status",
+    "enabledStatus": "Enabled",
+    "disabledStatus": "Disabled",
+    "chatIds": "Chat IDs",
+    "chatIdsPlaceholder": "Chat IDs (click button above to auto-fetch, or enter manually, separate multiple with commas)",
+    "chatIdsRequired": "Please enter at least one Chat ID",
+    "chatIdsExtra": "Multiple Chat IDs separated by commas, e.g., 123456789,987654321. Click button above to auto-fetch (need to send message to bot first)",
+    "chatIdsCount": " recipients",
+    "chatIdsNotConfigured": "Not Configured",
+    "edit": "Edit",
+    "test": "Test",
+    "delete": "Delete",
+    "deleteConfirm": "Are you sure you want to delete this configuration?",
+    "enableSuccess": "Enabled",
+    "disableSuccess": "Disabled",
+    "updateStatusFailed": "Failed to update",
+    "deleteSuccess": "Deleted successfully",
+    "deleteFailed": "Failed to delete",
+    "createSuccess": "Created successfully",
+    "createFailed": "Failed to create",
+    "updateSuccess": "Updated successfully",
+    "updateFailed": "Failed to update",
+    "fetchFailed": "Failed to get configuration list",
+    "testSuccess": "Test message sent successfully, please check Telegram",
+    "testFailed": "Failed to send test message",
+    "getChatIdsSuccess": "Successfully fetched {count} Chat ID(s)",
+    "getChatIdsFailed": "Failed to get Chat IDs",
+    "getChatIdsNoToken": "Please enter Bot Token first",
+    "getChatIdsNoMessage": "Chat ID not found, please send a message to the bot first (e.g., /start), then retry",
+    "getChatIdsButton": "Get Chat ID"
+  },
+  "telegramConfig": {
+    "title": "Telegram Configuration Guide",
+    "step1": "Create a Telegram bot via <strong>@BotFather</strong> and get Bot Token",
+    "step2": "After entering Bot Token, click 'Get Chat ID' button to auto-fetch (need to send message to bot first)",
+    "step3": "Or manually get Chat ID via <strong>@userinfobot</strong>",
+    "step4": "Support multiple Chat IDs (separated by commas), all configured users will receive notifications",
+    "step5": "Telegram messages will be sent automatically when orders succeed or fail",
+    "botToken": "Bot Token",
+    "botTokenPlaceholder": "Bot Token (from @BotFather)",
+    "botTokenRequired": "Please enter Bot Token"
+  },
+  "discordConfig": {
+    "title": "Discord Configuration Guide",
+    "step1": "Create a Webhook in Discord server",
+    "step2": "Copy Webhook URL and enter in configuration",
+    "step3": "Discord messages will be sent automatically when orders succeed or fail",
+    "webhookUrl": "Webhook URL",
+    "webhookUrlPlaceholder": "Webhook URL (from Discord server settings)",
+    "webhookUrlRequired": "Please enter Webhook URL"
+  },
+  "slackConfig": {
+    "title": "Slack Configuration Guide",
+    "step1": "Create an Incoming Webhook in Slack workspace",
+    "step2": "Copy Webhook URL and enter in configuration",
+    "step3": "Slack messages will be sent automatically when orders succeed or fail",
+    "webhookUrl": "Webhook URL",
+    "webhookUrlPlaceholder": "Webhook URL (from Slack App settings)",
+    "webhookUrlRequired": "Please enter Webhook URL"
   }
 }