Initial commit: Shop Database Flask Application

Flask backend with Vue 3 frontend for shop floor machine management.
Includes database schema export for MySQL shopdb_flask database.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

plugins/printers/__init__.py

@@ -0,0 +1,5 @@
+"""Printers plugin - extends machines with printer-specific functionality."""
+
+from .plugin import PrintersPlugin
+
+__all__ = ['PrintersPlugin']