示例流程

一次典型的代理会话：发现、注册、充值、订购、管理。

// 1. Discover plans (no auth)
list_plans()
// 2. Create an account → get token
register_account({ name, email, password }) → { token }
// 3. (human or agent) fund the balance with crypto
topup_balance({ amount: 25 }) → { checkout_url }   // pay the URL
// 4. Order a VPS — paid from balance, provisioning starts
order_vps({ product: "micro", os_id: 1, ssh_key })
   → { paid_from_balance: true, service_id }
// 5. Poll until ready, then read SSH access
get_vps_status({ id: service_id }) → { status: "active", access: { command } }