fix(mining): correctly parse network-progress API response

The API returns {success: true, data: {...}} but code was accessing
progressResult.currentContributionPerTree directly instead of
progressResult.data.currentContributionPerTree.

This caused:
- totalTreeCount to be 0 (undefined → 0)
- networkTotalContribution to be 0
- No mining distributions happening

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

backend/services/mining-service/src/application/services/network-sync.service.ts

@@ -145,24 +145,26 @@ export class NetworkSyncService {
         throw new Error(`Failed to fetch network progress: ${progressResponse.status}`);
       }
       const progressResult = await progressResponse.json();
+      // 从响应中提取 data 字段
+      const progressData = progressResult.data || progressResult;
 
       // 防御性检查：确保必要字段存在
-      if (!progressResult.currentContributionPerTree) {
+      if (!progressData.currentContributionPerTree) {
         this.logger.warn(
           `Network progress missing currentContributionPerTree, response: ${JSON.stringify(progressResult)}`,
         );
         // 使用默认值继续
-        progressResult.currentContributionPerTree = '20';
+        progressData.currentContributionPerTree = '20';
       }
 
       await this.handleNetworkProgressUpdated({
-        totalTreeCount: progressResult.totalTreeCount || 0,
-        totalAdoptionOrders: progressResult.totalAdoptionOrders || 0,
-        totalAdoptedUsers: progressResult.totalAdoptedUsers || 0,
-        currentUnit: progressResult.currentUnit || 1,
-        currentMultiplier: progressResult.currentMultiplier || '1',
-        currentContributionPerTree: progressResult.currentContributionPerTree,
-        nextUnitTreeCount: progressResult.nextUnitTreeCount || 100000,
+        totalTreeCount: progressData.totalTreeCount || 0,
+        totalAdoptionOrders: progressData.totalAdoptionOrders || 0,
+        totalAdoptedUsers: progressData.totalAdoptedUsers || 0,
+        currentUnit: progressData.currentUnit || 1,
+        currentMultiplier: progressData.currentMultiplier || '1',
+        currentContributionPerTree: progressData.currentContributionPerTree,
+        nextUnitTreeCount: progressData.nextUnitTreeCount || 100000,
       });
 
       // 3. 获取最新的 MiningConfig 来返回结果