feat: 订单列表按市场分组功能重构

- 后端实现按市场分组的订单列表接口
  - 添加 MarketGroupedOrdersRequest、MarketOrderStats、MarketOrderGroup、MarketGroupedOrdersResponse DTO
  - 实现 getBuyOrderListGroupedByMarket 和 getSellOrderListGroupedByMarket 方法
  - 添加 POST /api/copy-trading/orders/grouped-by-market 接口
  - 支持分页和统计信息（订单数、总金额、盈亏、成交状态等）

- 前端重构：移除前端分组逻辑，改为调用后端分组接口
  - BuyOrdersTab 和 SellOrdersTab 使用后端分组接口
  - 移除前端 useMemo 分组计算逻辑
  - 添加分组数据状态管理和分页支持

- 分组默认折叠状态
  - 移除桌面端自动展开逻辑
  - 所有设备默认折叠，用户手动展开

- 修复 moneyline URL 逻辑
  - getPolymarketUrl 函数添加 isMoneyline 参数
  - 暂时不自动跳转到 moneyline 页面（需要后端提供标识）

- 多语言支持
  - 添加 markets 翻译键（中文、繁体中文、英文）

frontend/src/locales/en/common.json

@@ -1062,6 +1062,7 @@
     "totalAmount": "Total Amount",
     "totalPnl": "Total PnL",
     "statusBreakdown": "Status",
+    "markets": "markets",
     "fetchBuyOrdersFailed": "Failed to fetch buy orders",
     "fetchSellOrdersFailed": "Failed to fetch sell orders",
     "fetchMatchedOrdersFailed": "Failed to fetch matched orders",

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

@@ -1060,8 +1060,8 @@
     "partiallyMatched": "部分成交",
     "orderCount": "订单数",
     "totalAmount": "总金额",
-    "totalPnl": "总盈亏",
     "statusBreakdown": "状态",
+    "markets": "个市场",
     "fetchBuyOrdersFailed": "获取买入订单列表失败",
     "fetchSellOrdersFailed": "获取卖出订单列表失败",
     "fetchMatchedOrdersFailed": "获取匹配关系列表失败",

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

@@ -1062,6 +1062,7 @@
     "totalAmount": "總金額",
     "totalPnl": "總盈虧",
     "statusBreakdown": "狀態",
+    "markets": "個市場",
     "fetchBuyOrdersFailed": "獲取買入訂單列表失敗",
     "fetchSellOrdersFailed": "獲取賣出訂單列表失敗",
     "fetchMatchedOrdersFailed": "獲取匹配關係列表失敗",