feat(deploy): 添加 HOT_WALLET 配置到 install 模板

在 deploy.sh 的 install() 函数中添加热钱包配置，
新部署时会自动包含这些环境变量。

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

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

backend/services/deploy.sh

@@ -123,6 +123,10 @@ SHARE_MASTER_KEY=${SHARE_MASTER_KEY}
 # MPC System Address (on 192.168.1.111)
 MPC_COORDINATOR_URL=http://192.168.1.111:8081
 MPC_MESSAGE_ROUTER_URL=ws://192.168.1.111:8082
+
+# MPC Hot Wallet (用于提现转账)
+HOT_WALLET_USERNAME=rwadurian-system-hot-wallet-01
+HOT_WALLET_ADDRESS=0x895aaf83C57f807416E3BbBd093d7aB74a6FDd33
 EOF
 
         chmod 600 "$ENV_FILE"