v0.1.17 — Fix integration install + auto-discover addon URL

Fixed - HA companion integration

• Fix "Invalid handler specified" — update deprecated HA imports
  (FlowResult → ConfigFlowResult, remove is_hassio)
• Auto-discover addon URL via Supervisor API — works regardless of
  repo hash in the addon hostname
• Auto-resolve URL after reboots — if the addon's IP changes, the
  integration re-discovers it via Supervisor API automatically
• Bump companion integration manifest version so the install script
  actually copies updated files to HA