fix(mining-service): make health endpoints public

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

@@ -2,9 +2,11 @@ import { Controller, Get } from '@nestjs/common';
 import { ApiTags, ApiOperation, ApiResponse } from '@nestjs/swagger';
 import { PrismaService } from '../../infrastructure/persistence/prisma/prisma.service';
 import { RedisService } from '../../infrastructure/redis/redis.service';
+import { Public } from '../../shared/guards/jwt-auth.guard';
 
 @ApiTags('Health')
 @Controller('health')
+@Public()
 export class HealthController {
   constructor(
     private readonly prisma: PrismaService,