Add HA print web UI and release version 0.1.8

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project are documented in this file.
+
+The format is based on Keep a Changelog and this project uses Semantic Versioning.
+
+## [0.1.8] - 2026-03-07
+
+### Added
+- Root URL now serves a built-in printer web interface for Home Assistant with status, info, text printing, and image upload printing.
+
+### Changed
+- Swagger docs remain available under `/docs` while the Home Assistant "Open" action now lands on the print UI.
+
+## [0.1.7] - 2026-03-07
+
+### Fixed
+- Home Assistant ingress docs now use a custom Swagger UI route with a relative `openapi.json` URL, avoiding `404 /openapi.json` behind ingress prefixes.
+
+### Changed
+- Home Assistant add-on now requests `full_access: true` in addition to Bluetooth capabilities to unblock Classic RFCOMM socket access on stricter hosts.
+
+## [0.1.6] - 2026-03-07
+
+### Added
+- Added this `CHANGELOG.md` and established a release policy to update version and changelog for every change.
+
+## [0.1.5] - 2026-03-07
+
+### Changed
+- Home Assistant add-on now requests `NET_RAW` in addition to `NET_ADMIN` for Classic Bluetooth RFCOMM sockets.
+- Add-on documentation updated with Classic permission requirements.
+
+## [0.1.4] - 2026-03-07
+
+### Fixed
+- RFCOMM connection under `uvloop` now uses direct Bluetooth socket connect in a worker thread, avoiding address-family resolution issues.
+- Classic Bluetooth socket errors are mapped to API-safe printer errors instead of unhandled 500s.
+
+## [0.1.3] - 2026-03-07
+
+### Changed
+- Home Assistant add-on metadata updated for ingress/web UI access.
+- API root endpoint now redirects to docs in an ingress-compatible way.
+- Added attribution for original upstream project and AI-assisted extension note.