Add Volcano Engine ECS scenario

[Copilot]

Implements ECS deployment scenario for Volcano Engine (火山引擎) following the existing Aliyun pattern.

Implementation

Created volcengine/ecs/ with complete Terraform configuration:

• Infrastructure: VPC, subnet, security group (all TCP ingress), EIP with 100Mbps bandwidth
• Instance: ecs.e-c1m1.large (2c2g), 20GB ESSD_PL0, Debian 12, PostPaid billing
• Authentication: Random 10-char SSH password via random_password resource
• Initialization: User data script installs base tools (curl, wget, tmux), enables BBR, configures tmux

Configuration

Provider credentials via environment variables:

export VOLCENGINE_ACCESS_KEY="..."
export VOLCENGINE_SECRET_KEY="..."

Standard redc commands:

redc pull volcengine/ecs
redc run volcengine/ecs
redc status [uuid]
redc stop [uuid]

Outputs public IP and SSH password for instance access.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[新场景] 实现火山引擎的 ecs 场景</issue_title>
<issue_description>参考目前模板编写教程，实现在 火山引擎 下部署 ecs 的场景

火山引擎的 tf 文档
https://registry.terraform.io/providers/volcengine/volcengine/latest/docs

火山引擎 的官方教程
https://www.volcengine.com/docs/6706/101977?lang=zh

配置和规格参考 阿里云的 ecs 实现，用按量计费，规格ecs.e-c1m1.large，存储 20g，操作系统用 debian，登录方式用随机生成的ssh密码</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [新场景] 实现火山引擎的 ecs 场景 #14

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[No-Github]

一个反直觉的点， ecs.e-c1m1.large 实际是 2 vCPU 2 GiB，需要修改下 说明 @copilot

[Copilot]

一个反直觉的点， ecs.e-c1m1.large 实际是 2 vCPU 2 GiB�...

已修复，更新为 2核2G内存。Commit: 069296b