fix(docker): add JWT_SECRET to mining-service and trading-service

Both services were missing JWT_SECRET environment variable, causing
401 Unauthorized errors when validating JWT tokens from auth-service.

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

backend/services/docker-compose.2.0.yml

@@ -76,6 +76,8 @@ services:
       REDIS_DB: 11
       # Kafka
       KAFKA_BROKERS: kafka:29092
+      # JWT 配置 (与 auth-service 共享密钥以验证 token)
+      JWT_SECRET: ${JWT_SECRET:-your-jwt-secret-change-in-production}
     ports:
       - "3021:3021"
     healthcheck:
@@ -108,6 +110,8 @@ services:
       KAFKA_BROKERS: kafka:29092
       # 2.0 内部服务调用
       MINING_SERVICE_URL: http://mining-service:3021
+      # JWT 配置 (与 auth-service 共享密钥以验证 token)
+      JWT_SECRET: ${JWT_SECRET:-your-jwt-secret-change-in-production}
     ports:
       - "3022:3022"
     healthcheck: