feat(identity-service): 添加阿里云短信服务配置到 docker-compose

在 identity-service 的环境变量中添加阿里云 SMS 配置：
- ALIYUN_ACCESS_KEY_ID: 阿里云 AccessKey ID
- ALIYUN_ACCESS_KEY_SECRET: 阿里云 AccessKey Secret
- ALIYUN_SMS_SIGN_NAME: 短信签名（默认：榴莲皇后）
- ALIYUN_SMS_TEMPLATE_CODE: 短信模板代码
- ALIYUN_SMS_ENDPOINT: API 端点（默认：dysmsapi.aliyuncs.com）
- SMS_ENABLED: 是否启用真实发送（默认：false，使用模拟模式）

配置后需在 .env 文件或系统环境变量中设置实际值。

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

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

backend/services/docker-compose.yml

@@ -134,6 +134,13 @@ services:
       - MINIO_SECRET_KEY=${MINIO_SECRET_KEY:-minio_secret_password}
       - MINIO_BUCKET_AVATARS=${MINIO_BUCKET_AVATARS:-avatars}
       - MINIO_PUBLIC_URL=${MINIO_PUBLIC_URL:-https://minio.szaiai.com}
+      # Aliyun SMS Service (阿里云短信服务)
+      - ALIYUN_ACCESS_KEY_ID=${ALIYUN_ACCESS_KEY_ID}
+      - ALIYUN_ACCESS_KEY_SECRET=${ALIYUN_ACCESS_KEY_SECRET}
+      - ALIYUN_SMS_SIGN_NAME=${ALIYUN_SMS_SIGN_NAME:-榴莲皇后}
+      - ALIYUN_SMS_TEMPLATE_CODE=${ALIYUN_SMS_TEMPLATE_CODE}
+      - ALIYUN_SMS_ENDPOINT=${ALIYUN_SMS_ENDPOINT:-dysmsapi.aliyuncs.com}
+      - SMS_ENABLED=${SMS_ENABLED:-false}
     depends_on:
       postgres:
         condition: service_healthy