fix(docker): remove cyclic dependency between referral-service and authorization-service

两个服务互相调用，形成循环依赖。移除 depends_on 约束，使用 fallback 机制处理服务暂时不可用的情况。

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

backend/services/docker-compose.yml

@@ -283,8 +283,9 @@ services:
         condition: service_healthy
       kafka:
         condition: service_started
-      authorization-service:
+      # 注意：不添加 authorization-service 依赖，避免循环依赖
-        condition: service_healthy
+      # referral-service <-> authorization-service 互相调用
+      # 使用 fallback 机制处理服务暂时不可用的情况
     healthcheck:
       test: ["CMD", "curl", "-f", "http://localhost:3004/api/v1/health"]
       interval: 30s