Add integration type to hassio

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

homeassistant/components/hassio/manifest.json

@@ -4,6 +4,7 @@
   "codeowners": ["@home-assistant/supervisor"],
   "dependencies": ["http", "repairs"],
   "documentation": "https://www.home-assistant.io/integrations/hassio",
+  "integration_type": "system",
   "iot_class": "local_polling",
   "quality_scale": "internal",
   "requirements": ["aiohasupervisor==0.3.3"],