Add add-on changelog and improve classic RFCOMM fallback (0.1.9)

fichero_printer/CHANGELOG.md

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+# Changelog
+
+## 0.1.9
+
+- Added add-on local changelog file so Home Assistant can display release notes.
+- Improved Classic Bluetooth RFCOMM connection robustness by trying fallback channels (1-3 plus configured channel).
+
+## 0.1.8
+
+- Added Home Assistant web print interface on `/` with status/info/text/image actions.
+
+## 0.1.7
+
+- Fixed ingress Swagger OpenAPI loading behind Home Assistant.
+- Enabled `full_access` for stricter hosts blocking RFCOMM sockets.
+
+## 0.1.6
+
+- Added root changelog and release policy.
+
+## 0.1.5
+
+- Added `NET_RAW` capability for Classic Bluetooth sockets.
+
+## 0.1.4
+
+- Fixed RFCOMM connect path under uvloop.
+
+## 0.1.3
+
+- Added ingress/webui metadata updates.
+