fix(mining): 修复 mining-service 订阅错误的 Kafka topic

问题：mining-service 订阅的是 cdc.contribution.outbox (Debezium CDC topic)，
但 contribution-service 使用 Outbox Pattern 直接发送到 contribution.{eventType} topic。

修复：
- mining-service 订阅正确的 topic 列表
- 修复消息解析逻辑支持 Outbox Pattern 消息格式
- contribution-service 添加 GET /admin/unallocated-contributions 端点（调试用）

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

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

@@ -489,6 +489,51 @@ export class AdminController {
     };
   }
 
+  @Get('unallocated-contributions')
+  @Public()
+  @ApiOperation({ summary: '获取所有未分配算力列表，供 mining-service 定时同步' })
+  async getUnallocatedContributions(): Promise<{
+    contributions: Array<{
+      sourceAdoptionId: string;
+      sourceAccountSequence: string;
+      wouldBeAccountSequence: string | null;
+      contributionType: string;
+      amount: string;
+      reason: string | null;
+      effectiveDate: string;
+      expireDate: string;
+    }>;
+    total: number;
+  }> {
+    const unallocatedContributions = await this.prisma.unallocatedContribution.findMany({
+      where: { status: 'PENDING' },
+      select: {
+        sourceAdoptionId: true,
+        sourceAccountSequence: true,
+        wouldBeAccountSequence: true,
+        unallocType: true,
+        amount: true,
+        reason: true,
+        effectiveDate: true,
+        expireDate: true,
+      },
+    });
+
+    return {
+      contributions: unallocatedContributions.map((uc) => ({
+        sourceAdoptionId: uc.sourceAdoptionId.toString(),
+        sourceAccountSequence: uc.sourceAccountSequence,
+        wouldBeAccountSequence: uc.wouldBeAccountSequence,
+        contributionType: uc.unallocType,
+        amount: uc.amount.toString(),
+        reason: uc.reason,
+        effectiveDate: uc.effectiveDate.toISOString(),
+        expireDate: uc.expireDate.toISOString(),
+      })),
+      total: unallocatedContributions.length,
+    };
+  }
+
   @Post('unallocated-contributions/publish-all')
   @Public()
   @ApiOperation({ summary: '发布所有未分配算力事件到 outbox，用于同步到 mining-service' })

backend/services/mining-service/src/application/event-handlers/contribution-event.handler.ts

@@ -17,7 +17,16 @@ export class ContributionEventHandler implements OnModuleInit {
 
   async onModuleInit() {
     const kafkaBrokers = this.configService.get<string>('KAFKA_BROKERS', 'localhost:9092');
-    const topic = this.configService.get<string>('CDC_TOPIC_CONTRIBUTION_OUTBOX', 'cdc.contribution.outbox');
+
+    // contribution-service 使用 Outbox Pattern 直接发送 Kafka 消息到这些 topic
+    // topic 名称格式: contribution.{eventType.toLowerCase()}
+    const topics = [
+      'contribution.contributionaccountupdated',
+      'contribution.dailysnapshotcreated',
+      'contribution.systemaccountsynced',
+      'contribution.networkprogressupdated',
+      'contribution.unallocatedcontributionsynced',
+    ];
 
     const kafka = new Kafka({
       clientId: 'mining-service',
@@ -28,7 +37,11 @@ export class ContributionEventHandler implements OnModuleInit {
 
     try {
       await this.consumer.connect();
-      await this.consumer.subscribe({ topic, fromBeginning: false });
+
+      // 订阅多个 topic
+      for (const topic of topics) {
+        await this.consumer.subscribe({ topic, fromBeginning: false });
+      }
 
       await this.consumer.run({
         eachMessage: async (payload: EachMessagePayload) => {
@@ -36,7 +49,7 @@ export class ContributionEventHandler implements OnModuleInit {
         },
       });
 
-      this.logger.log(`Subscribed to ${topic} for contribution sync`);
+      this.logger.log(`Subscribed to ${topics.length} topics for contribution sync: ${topics.join(', ')}`);
     } catch (error) {
       this.logger.error('Failed to connect to Kafka for contribution sync', error);
     }
@@ -44,15 +57,15 @@ export class ContributionEventHandler implements OnModuleInit {
 
   private async handleMessage(payload: EachMessagePayload): Promise<void> {
     try {
-      const { message } = payload;
+      const { message, topic } = payload;
       if (!message.value) return;
 
       const event = JSON.parse(message.value.toString());
 
-      // CDC 消息格式：{ after: { event_type, payload, ... } }
+      // Outbox Pattern 直接发送的消息格式：payload 本身就是事件数据
-      const data = event.after || event;
+      // 可以通过 topic 或 eventType 字段判断事件类型
-      const eventType = data.event_type || data.eventType;
+      const eventPayload = event.eventType ? event : (event.payload || event);
-      const eventPayload = typeof data.payload === 'string' ? JSON.parse(data.payload) : data.payload;
+      const eventType = eventPayload.eventType || this.extractEventTypeFromTopic(topic);
 
       if (!eventPayload) return;
 
@@ -112,4 +125,27 @@ export class ContributionEventHandler implements OnModuleInit {
       this.logger.error('Failed to handle contribution event', error);
     }
   }
+
+  /**
+   * 从 topic 名称提取事件类型
+   * 例如: contribution.unallocatedcontributionsynced -> UnallocatedContributionSynced
+   */
+  private extractEventTypeFromTopic(topic: string): string {
+    // topic 格式: contribution.{eventtype}
+    const parts = topic.split('.');
+    if (parts.length < 2) return '';
+
+    const rawType = parts[1]; // e.g., unallocatedcontributionsynced
+
+    // 已知的事件类型映射
+    const typeMap: Record<string, string> = {
+      contributionaccountupdated: 'ContributionAccountUpdated',
+      dailysnapshotcreated: 'DailySnapshotCreated',
+      systemaccountsynced: 'SystemAccountSynced',
+      networkprogressupdated: 'NetworkProgressUpdated',
+      unallocatedcontributionsynced: 'UnallocatedContributionSynced',
+    };
+
+    return typeMap[rawType] || rawType;
+  }
 }

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

@@ -168,6 +168,7 @@ export class NetworkSyncService {
       });
 
       // 3. 获取最新的 MiningConfig 来返回结果
+      // 注：未分配算力通过 CDC (Kafka) 实时同步，不需要定时拉取
       const config = await this.prisma.miningConfig.findFirst();
 
       return {