```

feat(api): 添加OLT端口管理和设备发现功能

- 在check.py中更新discover_olt方法，使用scan_and_discover替代check_olt_devices
- 在olt.py中添加get_olt_ports和toggle_olt_port接口，支持获取和控制OLT端口状态
- 添加TogglePortRequest模型用于端口操作请求验证
- 更新SSHService类，新增get_olt_ports和toggle_olt_port方法
- 优化CheckService中的MAC地址索引逻辑，支持模型信息更新
```

backend/app/services/ssh_service.py

@@ -276,6 +276,66 @@ class SSHService:
             model=model
         )
 
+    def get_olt_ports(self) -> list:
+        """获取所有 Olt 端口状态，返回 [{'name': 'Olt1/0/1', 'status': 'up'}, ...]"""
+        output = self.execute_command("display interface brief")
+        ports = []
+        for line in output.splitlines():
+            line = line.strip()
+            if not line.startswith("Olt"):
+                continue
+            parts = line.split()
+            if len(parts) < 2:
+                continue
+            name = parts[0]
+            link = parts[1].upper()
+            # ADM 表示 administratively down（手动关闭）
+            if link == "ADM":
+                status = "adm-down"
+            elif link == "UP":
+                status = "up"
+            else:
+                status = "down"
+            ports.append({"name": name, "status": status})
+        return ports
+
+    def toggle_olt_port(self, port_name: str, action: str) -> bool:
+        """开启或关闭 OLT 端口
+        action: 'shutdown' 或 'undo shutdown'
+        流程: system-view -> interface {port_name} -> shutdown/undo shutdown -> quit -> quit
+        """
+        if not self.shell:
+            raise Exception("SSH 未连接")
+
+        def send_and_wait(cmd: str, expect: str, timeout: int = 10) -> str:
+            self.shell.send(cmd + "\n")
+            buf = ""
+            deadline = time.time() + timeout
+            while time.time() < deadline:
+                if self.shell.recv_ready():
+                    buf += self.shell.recv(4096).decode('utf-8', errors='ignore')
+                    if expect in buf:
+                        return buf
+                else:
+                    time.sleep(0.2)
+            return buf
+
+        out = send_and_wait("system-view", "]")
+        if "]" not in out:
+            raise Exception("进入 system-view 失败")
+
+        out = send_and_wait(f"interface {port_name}", "]")
+        if "]" not in out:
+            raise Exception(f"进入端口 {port_name} 失败")
+
+        out = send_and_wait(action, "]")
+        if "]" not in out:
+            raise Exception(f"执行 {action} 失败")
+
+        send_and_wait("quit", "]", timeout=5)
+        send_and_wait("quit", ">", timeout=5)
+        return True
+
     def close(self):
         """关闭 SSH 连接"""
         if self.client: