Mark custom panel integration as system type (#126883)

homeassistant/components/panel_custom/manifest.json

@@ -4,5 +4,6 @@
   "codeowners": ["@home-assistant/frontend"],
   "dependencies": ["frontend"],
   "documentation": "https://www.home-assistant.io/integrations/panel_custom",
+  "integration_type": "system",
   "quality_scale": "internal"
 }

homeassistant/generated/integrations.json

@@ -4537,11 +4537,6 @@
       "config_flow": false,
       "iot_class": "local_polling"
     },
-    "panel_custom": {
-      "name": "Custom Panel",
-      "integration_type": "hub",
-      "config_flow": false
-    },
     "panel_iframe": {
       "name": "iframe Panel",
       "integration_type": "hub",