fix(mining-service): make mining API public for service-to-service calls

Add @Public() decorator to MiningController to allow mining-admin-service
to fetch mining records without authentication.

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

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

@@ -2,9 +2,11 @@ import { Controller, Get, Param, Query, NotFoundException } from '@nestjs/common
 import { ApiTags, ApiOperation, ApiResponse, ApiParam, ApiQuery } from '@nestjs/swagger';
 import { GetMiningAccountQuery } from '../../application/queries/get-mining-account.query';
 import { GetMiningStatsQuery } from '../../application/queries/get-mining-stats.query';
+import { Public } from '../../shared/guards/jwt-auth.guard';
 
 @ApiTags('Mining')
 @Controller('mining')
+@Public()  // 服务间调用，不需要认证
 export class MiningController {
   constructor(
     private readonly getAccountQuery: GetMiningAccountQuery,