fix(nextion): display actual IP address instead of panel_id on screen

backend/app.py

@@ -179,6 +179,26 @@ def _port_status_to_pic(port_state_entry):
     return 3  # CONNECTED
 
 
+def _get_display_ip():
+    """获取用于屏幕显示的本机 IP 地址。"""
+    try:
+        net_status = network_manager.get_network_status()
+        for iface, data in net_status.get('interfaces', {}).items():
+            if iface in ('lo', 'docker0') or iface.startswith(('br-', 'veth')):
+                continue
+            for addr in data.get('ip_addresses', []):
+                if '.' in addr and not addr.startswith('127.'):
+                    return addr
+        # 回退：尝试网络配置中的静态 IP
+        net_config = network_manager.get_network_config()
+        static_ip = net_config.get('static_config', {}).get('ip_address')
+        if static_ip:
+            return static_ip
+    except Exception as e:
+        logger.warning(f"获取显示 IP 失败: {e}")
+    return ''
+
+
 def _screen_refresh_worker():
     """在后台线程中异步刷新 Nextion 屏幕。"""
     while True:
@@ -221,8 +241,11 @@ def refresh_screen_panel(panel_id):
 
         delay_ms = NEXTION_CMD_DELAY_MS
 
+        # 获取本机 IP 地址显示在 t1.txt
+        ip_address = _get_display_ip()
+
         screen_display.send_cmd(f't2.txt="{NEXTION_PANEL_NAME_PREFIX}{idx + 1}"', delay_ms=delay_ms)
-        screen_display.send_cmd(f't1.txt="{panel_id}"', delay_ms=delay_ms)
+        screen_display.send_cmd(f't1.txt="{ip_address}"', delay_ms=delay_ms)
         screen_display.send_cmd(f't4.txt="{dtu_config.get("firmware_version", "v1.0.0")}"', delay_ms=delay_ms)
 
         mqtt_str = '已连接' if mqtt_connected else '未连接'