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>

.gitignore

@@ -0,0 +1,3 @@
+__pycache__/
+*.log
+*.bin