feat: 消息推送自定义模板与独立设置页

后端:
- 新增通知模板表与实体、DTO、Repository、NotificationTemplateService
- 支持 {{variable}} 模板语法，提供模板类型与变量接口
- TelegramNotificationService 改为通过模板渲染发送（ORDER_SUCCESS/ORDER_FAILED/ORDER_FILTERED/CRYPTO_TAIL_SUCCESS/REDEEM_SUCCESS/REDEEM_NO_RETURN）
- 模板 CRUD、重置默认、测试发送接口
- 补全订单过滤相关 i18n key（zh/en/zh-TW）

前端:
- 消息推送设置抽离为独立页 /system-settings/notification
- 系统设置概览改为入口卡片，侧栏增加「消息推送设置」菜单
- NotificationSettingsPage: 机器人配置 + 模板配置双卡片布局（与概览一致）
- 模板配置支持选择类型、编辑内容、变量面板（点击复制、悬停说明）、保存/重置/测试
- 多语言 key 补全（notificationSettings.templates.*、templateTypes.*）

Made-with: Cursor

frontend/src/locales/en/common.json

@@ -1167,7 +1167,42 @@
     "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"
+    "getChatIdsButton": "Get Chat ID",
+    "botConfig": "Bot Configuration",
+    "templateConfig": "Template Configuration",
+    "templates": {
+      "title": "Message Template Configuration",
+      "templateType": "Template Type",
+      "templateContent": "Template Content",
+      "isDefault": "Default Template",
+      "isCustom": "Custom Template",
+      "resetToDefault": "Reset to Default",
+      "resetConfirm": "Are you sure you want to reset to default? Your custom content will be lost.",
+      "resetSuccess": "Reset successfully",
+      "resetFailed": "Reset failed",
+      "saveSuccess": "Saved successfully",
+      "saveFailed": "Save failed",
+      "testSuccess": "Test message sent successfully, please check Telegram",
+      "testFailed": "Failed to send test message",
+      "variables": "Available Variables",
+      "clickToCopy": "Click to copy",
+      "copied": "Copied",
+      "commonVariables": "Common Variables",
+      "orderVariables": "Order Variables",
+      "copyTradingVariables": "Copy Trading Variables",
+      "redeemVariables": "Redeem Variables",
+      "errorVariables": "Error Variables",
+      "filterVariables": "Filter Variables",
+      "strategyVariables": "Strategy Variables"
+    },
+    "templateTypes": {
+      "ORDER_SUCCESS": "Order Success",
+      "ORDER_FAILED": "Order Failed",
+      "ORDER_FILTERED": "Order Filtered",
+      "CRYPTO_TAIL_SUCCESS": "Crypto Spread Strategy Success",
+      "REDEEM_SUCCESS": "Position Redeem Success",
+      "REDEEM_NO_RETURN": "Position Settled (No Return)"
+    }
   },
   "telegramConfig": {
     "title": "Telegram Configuration Guide",

frontend/src/locales/zh-CN/common.json

@@ -1167,7 +1167,42 @@
     "getChatIdsFailed": "获取 Chat IDs 失败",
     "getChatIdsNoToken": "请先填写 Bot Token",
     "getChatIdsNoMessage": "未找到 Chat ID，请先向机器人发送一条消息（如 /start），然后重试",
-    "getChatIdsButton": "获取 Chat ID"
+    "getChatIdsButton": "获取 Chat ID",
+    "botConfig": "机器人配置",
+    "templateConfig": "模板配置",
+    "templates": {
+      "title": "消息模板配置",
+      "templateType": "模板类型",
+      "templateContent": "模板内容",
+      "isDefault": "默认模板",
+      "isCustom": "自定义模板",
+      "resetToDefault": "重置为默认",
+      "resetConfirm": "确定要重置为默认模板吗？您的自定义内容将丢失。",
+      "resetSuccess": "重置成功",
+      "resetFailed": "重置失败",
+      "saveSuccess": "保存成功",
+      "saveFailed": "保存失败",
+      "testSuccess": "测试消息发送成功，请检查 Telegram",
+      "testFailed": "测试消息发送失败",
+      "variables": "可用变量",
+      "clickToCopy": "点击复制",
+      "copied": "已复制",
+      "commonVariables": "通用变量",
+      "orderVariables": "订单变量",
+      "copyTradingVariables": "跟单变量",
+      "redeemVariables": "赎回变量",
+      "errorVariables": "错误变量",
+      "filterVariables": "过滤变量",
+      "strategyVariables": "策略变量"
+    },
+    "templateTypes": {
+      "ORDER_SUCCESS": "订单成功通知",
+      "ORDER_FAILED": "订单失败通知",
+      "ORDER_FILTERED": "订单过滤通知",
+      "CRYPTO_TAIL_SUCCESS": "加密价差策略成功通知",
+      "REDEEM_SUCCESS": "仓位赎回成功通知",
+      "REDEEM_NO_RETURN": "仓位结算（无收益）通知"
+    }
   },
   "telegramConfig": {
     "title": "Telegram 配置说明",

frontend/src/locales/zh-TW/common.json

@@ -1167,7 +1167,42 @@
     "getChatIdsFailed": "獲取 Chat IDs 失敗",
     "getChatIdsNoToken": "請先填寫 Bot Token",
     "getChatIdsNoMessage": "未找到 Chat ID，請先向機器人發送一條消息（如 /start），然後重試",
-    "getChatIdsButton": "獲取 Chat ID"
+    "getChatIdsButton": "獲取 Chat ID",
+    "botConfig": "機器人配置",
+    "templateConfig": "模板配置",
+    "templates": {
+      "title": "消息模板配置",
+      "templateType": "模板類型",
+      "templateContent": "模板內容",
+      "isDefault": "默認模板",
+      "isCustom": "自定義模板",
+      "resetToDefault": "重置為默認",
+      "resetConfirm": "確定要重置為默認模板嗎？您的自定義內容將丟失。",
+      "resetSuccess": "重置成功",
+      "resetFailed": "重置失敗",
+      "saveSuccess": "保存成功",
+      "saveFailed": "保存失敗",
+      "testSuccess": "測試消息發送成功，請檢查 Telegram",
+      "testFailed": "測試消息發送失敗",
+      "variables": "可用變量",
+      "clickToCopy": "點擊複製",
+      "copied": "已複製",
+      "commonVariables": "通用變量",
+      "orderVariables": "訂單變量",
+      "copyTradingVariables": "跟單變量",
+      "redeemVariables": "贖回變量",
+      "errorVariables": "錯誤變量",
+      "filterVariables": "過濾變量",
+      "strategyVariables": "策略變量"
+    },
+    "templateTypes": {
+      "ORDER_SUCCESS": "訂單成功通知",
+      "ORDER_FAILED": "訂單失敗通知",
+      "ORDER_FILTERED": "訂單過濾通知",
+      "CRYPTO_TAIL_SUCCESS": "加密價差策略成功通知",
+      "REDEEM_SUCCESS": "倉位贖回成功通知",
+      "REDEEM_NO_RETURN": "倉位結算（無收益）通知"
+    }
   },
   "telegramConfig": {
     "title": "Telegram 配置說明",