fix(mining-admin): transform dashboard API response to match frontend expected format

Frontend expects flat DashboardStats and RealtimeData interfaces.
Transform backend nested response to:
- totalUsers, adoptedUsers, networkEffectiveContribution, etc.
- currentMinuteDistribution, activeOrders, pendingTrades, etc.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/services/mining-admin-service/src/api/controllers/dashboard.controller.ts

@@ -16,19 +16,50 @@ export class DashboardController {
   @Get()
   @ApiOperation({ summary: '获取仪表盘统计数据' })
   async getStats() {
-    return this.dashboardService.getDashboardStats();
+    const raw = await this.dashboardService.getDashboardStats();
+
+    // 计算24小时价格变化
+    let priceChange24h = 0;
+    if (raw.latestPrice) {
+      const open = parseFloat(raw.latestPrice.open) || 1;
+      const close = parseFloat(raw.latestPrice.close) || 1;
+      priceChange24h = (close - open) / open;
+    }
+
+    // 转换为前端期望的格式
+    return {
+      totalUsers: raw.users?.total || 0,
+      adoptedUsers: raw.users?.adopted || 0,
+      networkEffectiveContribution: raw.contribution?.effectiveContribution || '0',
+      totalDistributed: raw.mining?.totalMined || '0',
+      totalBurned: raw.mining?.latestDailyStat?.totalBurned || '0',
+      circulationPool: raw.trading?.circulationPool?.totalShares || '0',
+      currentPrice: raw.latestPrice?.close || '1',
+      priceChange24h,
+      totalOrders: raw.trading?.totalAccounts || 0,
+      totalTrades: raw.trading?.totalAccounts || 0,
+    };
   }
 
   @Get('stats')
   @ApiOperation({ summary: '获取仪表盘统计数据（别名）' })
   async getStatsAlias() {
-    return this.dashboardService.getDashboardStats();
+    return this.getStats();
   }
 
   @Get('realtime')
   @ApiOperation({ summary: '获取实时数据' })
   async getRealtimeStats() {
-    return this.dashboardService.getRealtimeStats();
+    const raw = await this.dashboardService.getRealtimeStats();
+
+    // 转换为前端期望的格式
+    return {
+      currentMinuteDistribution: raw.minuteDistribution || '0',
+      currentMinuteBurn: '0', // 暂无实时销毁数据
+      activeOrders: 0, // 暂无实时订单数据
+      pendingTrades: 0, // 暂无待处理交易数据
+      lastPriceUpdateAt: raw.timestamp,
+    };
   }
 
   @Get('reports')