docs: add control panel deployment guide

docs/deployment.md

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+# SafeSight Control 部署指南
+
+## 打包
+
+在开发机上：
+
+```bash
+cd safesight-control
+bash scripts/package.sh
+```
+
+生成 `safesight-control-*.tar.gz`，包含 ARM64 和 AMD64 两个二进制。
+
+---
+
+## 部署
+
+### 部署到 Edge 设备（ARM64）
+
+```bash
+# 传到设备
+scp safesight-control-*.tar.gz orangepi@10.0.0.81:/tmp/
+
+# 在设备上
+cd /tmp && tar -xzf safesight-control-*.tar.gz
+cd safesight-control-*
+sudo cp safesightd-linux-arm64 /usr/local/bin/safesightd
+sudo chmod +x /usr/local/bin/safesightd
+
+# 创建配置
+sudo mkdir -p /opt/safesightd/config
+sudo cp safesightd.json.example /opt/safesightd/config/safesightd.json
+sudo vi /opt/safesightd/config/safesightd.json  # 修改 agent_token
+
+# 安装服务
+sudo cp safesightd.service /etc/systemd/system/
+sudo systemctl daemon-reload
+sudo systemctl enable --now safesightd
+```
+
+### 部署到独立 Linux 服务器（AMD64）
+
+```bash
+# 同上，使用 safesightd-linux-amd64
+sudo cp safesightd-linux-amd64 /usr/local/bin/safesightd
+```
+
+其余步骤相同。
+
+---
+
+## 配置
+
+编辑 `/opt/safesightd/config/safesightd.json`：
+
+```json
+{
+  "listen": "0.0.0.0:18080",
+  "discovery_port": 35688,
+  "agent_token": "<与 edge agent 相同的 token>",
+  "concurrency": 5,
+  "data_dir": "/opt/safesightd/data",
+  "offline_after_ms": 10000
+}
+```
+
+---
+
+## 验证
+
+```bash
+systemctl status safesightd
+curl http://localhost:18080/health
+```
+
+浏览器打开 `http://<IP>:18080`