fix(api): 修复邮件队列超时并补齐调度进程

延长 SendEmailJob 超时并改为超时直接失败，补充重试退避、
失败日志与收件人脱敏，避免 send_email 队列批量超时重试。

新增 MAIL_TIMEOUT 与 QUEUE_RETRY_AFTER 配置，并抽出邮件运行时
配置与 HTML 内容服务，确保 Horizon 常驻进程使用最新邮件配置。

为 Docker、supervisor 与 compose 样例补齐 scheduler 进程，并在
节点管理端开启墙检测托管时立即触发一次检测，保证定时任务持续生效。

deploy/xboard-server/.env.example

@@ -0,0 +1,59 @@
+# Docker Compose images and ports
+XBOARD_IMAGE=ghcr.io/micah123321/xboard:new
+XBOARD_ADMIN_IMAGE=ghcr.io/micah123321/xboard-admin-frontend:new
+REDIS_IMAGE=redis:8-alpine
+WEB_PORT=7001
+ADMIN_PORT=7002
+WS_PORT=8076
+
+# Admin frontend reverse proxy targets inside the compose network
+XBOARD_BACKEND_UPSTREAM=http://web:7001
+XBOARD_UPLOAD_UPSTREAM=https://pic.535888.xyz
+
+# Laravel application
+APP_NAME=XBoard
+APP_ENV=production
+APP_KEY=
+APP_DEBUG=false
+APP_URL=https://your-domain.example
+LOG_CHANNEL=stack
+
+# Database: this template expects an external MySQL server
+DB_CONNECTION=mysql
+DB_HOST=your-mysql-host
+DB_PORT=3306
+DB_DATABASE=xboard
+DB_USERNAME=xboard
+DB_PASSWORD=change-me
+
+# Redis: shared unix socket from the redis-data volume
+REDIS_HOST=/data/redis.sock
+REDIS_PASSWORD=null
+REDIS_PORT=0
+
+# Queue, cache and session
+BROADCAST_DRIVER=log
+CACHE_DRIVER=redis
+QUEUE_CONNECTION=redis
+QUEUE_RETRY_AFTER=90
+SESSION_DRIVER=file
+MASS_EMAIL_HOURLY_LIMIT=500
+
+# Mail
+MAIL_DRIVER=smtp
+MAIL_HOST=smtp.example.com
+MAIL_PORT=587
+MAIL_TIMEOUT=30
+MAIL_USERNAME=
+MAIL_PASSWORD=
+MAIL_ENCRYPTION=tls
+MAIL_FROM_ADDRESS=no-reply@example.com
+MAIL_FROM_NAME=XBoard
+MAILGUN_DOMAIN=
+MAILGUN_SECRET=
+
+# Backup and installation flags
+ENABLE_AUTO_BACKUP_AND_UPDATE=false
+GOOGLE_CLOUD_KEY_FILE=config/googleCloudStorageKey.json
+GOOGLE_CLOUD_STORAGE_BUCKET=
+INSTALLED=false