v0.1.3 — Fix critical API routing bug (404)

Changelog

[0.1.3] – 2026-05-22

Fixed

• Critical bugfix — API requests returned 404 after install.
  Root cause: hass.callApi("GET", path) prepends /api/, but
  API_BASE had a leading / producing double-slash in the URL;
  the three backend view URLs also lacked the required /api/ prefix.
• Fixed: API_BASE changed to relative path "action_explorer" so the
  final URL is /api/action_explorer/entities (no double-slash).
• Fixed: all three HomeAssistantView.url attributes now include the
  /api/ prefix: /api/action_explorer/entities,
  /api/action_explorer/actions/{entity_id}, /api/action_explorer/automation.
• Fixed: MANIFEST_VERSION bump causes panel_custom to inject a
  ?v=<VERSION> query string onto the JS URL, forcing a browser reload
  because HA serves static files with immutable cache headers.

Changed

• README rewritten with step-by-step usage walkthrough, ASCII workflow
  diagram, quick-start table, example entity/action cheat sheet, and
  troubleshooting FAQ.