Zabbix supply backend rebuild + data-driven model supplies

Rewrite the printer Zabbix integration (Bearer auth, host-by-IP, tag-based
supply lookup, ping) and replace the hardcoded toner table with a
modelsupplies table + CRUD + seed. Add mock Zabbix server, live test
harness, and the Playwright screenshot tooling.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

plugins/printers/models/__init__.py

@@ -2,9 +2,19 @@
 
 from .printer_extension import PrinterData  # Legacy model for Machine-based architecture
 from .printer import Printer, PrinterType  # New Asset-based models
+from .model_supply import (  # data-driven model -> toner/drum/waste mapping
+    ModelSupply,
+    SUPPLY_TYPES,
+    SUPPLY_COLORS,
+    CAPACITY_TIERS,
+)
 
 __all__ = [
     'PrinterData',  # Legacy
     'Printer',      # New
     'PrinterType',  # New
+    'ModelSupply',
+    'SUPPLY_TYPES',
+    'SUPPLY_COLORS',
+    'CAPACITY_TIERS',
 ]