LX-D02 BLE thermal printer: PC, Windows printer, Home Assistant

- printer.py: protocol with flow control (pause / resend / done)
- lxd02.py: print text or pictures from the command line
- windows/: POS-58 driver + local ESC/POS server = a regular Windows printer,
  Explorer menu for pictures
- custom_components/lxd02: Home Assistant integration with a persistent queue

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

custom_components/lxd02/services.yaml

@@ -0,0 +1,38 @@
+print_text:
+  name: Print text
+  description: Print text on the LX-D02 thermal printer.
+  fields:
+    text:
+      name: Text
+      required: true
+      example: "Temperature: 21.5 °C"
+      selector:
+        text:
+          multiline: true
+    size:
+      name: Font size
+      default: 28
+      selector:
+        number:
+          min: 10
+          max: 120
+    density:
+      name: Density
+      default: 3
+      selector:
+        number:
+          min: 0
+          max: 7
+    separator:
+      name: Separator line
+      description: Draw a horizontal line under the text.
+      default: false
+      selector:
+        boolean:
+    feed:
+      name: Feed after (rows of 2 dots)
+      default: 40
+      selector:
+        number:
+          min: 0
+          max: 500