feat: Leader列表优化

- 后端过滤价值为0的仓位
- 持仓列表显示市场名称而非ID
- 列表移除分类和创建时间列
- 文案'跟单关系数'改为'跟单数'
- 持仓DTO添加title字段

frontend/src/locales/en/common.json

@@ -4,6 +4,7 @@
     "save": "Save",
     "cancel": "Cancel",
     "edit": "Edit",
+    "viewDetail": "View Details",
     "delete": "Delete",
     "add": "Add",
     "search": "Search",
@@ -481,6 +482,37 @@
     "fetchFailed": "Failed to get Leader details",
     "invalidId": "Invalid Leader ID"
   },
+  "leaderDetail": {
+    "title": "Leader Details",
+    "loading": "Loading...",
+    "invalidId": "Invalid Leader ID",
+    "fetchFailed": "Failed to get Leader details",
+    "fetchBalanceFailed": "Failed to get balance",
+    "noBalanceData": "No balance data",
+    "basicInfo": "Basic Information",
+    "leaderName": "Leader Name",
+    "leaderAddress": "Wallet Address",
+    "category": "Category",
+    "copyTradingCount": "Copy Trading Count",
+    "remark": "Remark",
+    "createdAt": "Created At",
+    "updatedAt": "Updated At",
+    "website": "Website",
+    "openWebsite": "Open Website",
+    "balanceInfo": "Balance Information",
+    "refresh": "Refresh",
+    "availableBalance": "Available Balance",
+    "positionBalance": "Position Balance",
+    "totalBalance": "Total Balance",
+    "positions": "Positions",
+    "noPositions": "No positions",
+    "marketId": "Market ID",
+    "side": "Side",
+    "quantity": "Quantity",
+    "avgPrice": "Avg Price",
+    "currentValue": "Current Value",
+    "pnl": "PnL"
+  },
   "userList": {
     "title": "User Management",
     "username": "Username",