feat: 订单列表按市场分组并支持跳转到Polymarket

- 后端添加市场slug和分类字段
  - 在 BuyOrderInfo、SellOrderInfo、MatchedOrderInfo DTO 中添加 marketSlug 和 marketCategory 字段
  - 在 CopyTradingStatisticsService 中填充这些字段（从 Market 实体获取）

- 前端实现按市场分组功能
  - 添加分组视图切换开关（列表视图/分组视图）
  - 分组显示：按市场分组，显示市场名称、订单数、总金额、盈亏等统计信息
  - 买入订单分组显示是否完全成交状态（全部成交/部分成交）
  - 卖出订单分组显示总盈亏
  - 支持展开/折叠功能（单个和全部）
  - 桌面端默认全部展开，移动端默认全部折叠

- 市场名称点击跳转功能
  - 添加 getPolymarketUrl 工具函数，根据市场分类构建URL
  - sports 分类市场跳转到 /moneyline 页面（spread 市场）
  - 其他分类市场跳转到普通市场页面
  - 如果没有 slug，使用 marketId 作为后备（跳转到 condition 页面）
  - 分组视图、列表视图、移动端卡片视图均支持点击跳转

- 多语言支持
  - 添加分组相关翻译键：groupByMarket、expandAll、collapseAll、allFullyMatched、partiallyMatched、orderCount、totalAmount、totalPnl、statusBreakdown

frontend/src/locales/en/common.json

@@ -1053,6 +1053,15 @@
     "noBuyOrders": "No buy orders",
     "noSellOrders": "No sell orders",
     "noMatchedOrders": "No matched orders",
+    "groupByMarket": "Group by Market",
+    "expandAll": "Expand All",
+    "collapseAll": "Collapse All",
+    "allFullyMatched": "All Fully Matched",
+    "partiallyMatched": "Partially Matched",
+    "orderCount": "Order Count",
+    "totalAmount": "Total Amount",
+    "totalPnl": "Total PnL",
+    "statusBreakdown": "Status",
     "fetchBuyOrdersFailed": "Failed to fetch buy orders",
     "fetchSellOrdersFailed": "Failed to fetch sell orders",
     "fetchMatchedOrdersFailed": "Failed to fetch matched orders",