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/migrations/versions/0002_modelsupplies.py

@@ -0,0 +1,44 @@
+"""printers plugin: add modelsupplies table
+
+Data-driven model -> toner/drum/waste part-number mapping. Replaces the old
+hardcoded supply_parts table.
+
+Revision ID: 0002_modelsupplies_printers
+Revises: 0001_baseline_printers
+Create Date: 2026-06-25
+
+"""
+import sqlalchemy as sa
+from alembic import op
+
+
+revision = '0002_modelsupplies_printers'
+down_revision = '0001_baseline_printers'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.create_table(
+        'modelsupplies',
+        sa.Column('modelsupplyid', sa.Integer, primary_key=True),
+        sa.Column('modelnumberid', sa.Integer,
+                  sa.ForeignKey('models.modelnumberid'), nullable=False),
+        sa.Column('supplytype', sa.String(20), nullable=False, server_default='toner'),
+        sa.Column('color', sa.String(20), nullable=False, server_default='none'),
+        sa.Column('capacitytier', sa.String(20), nullable=False, server_default='standard'),
+        sa.Column('partnumber', sa.String(50), nullable=False),
+        sa.Column('marketingname', sa.String(120)),
+        sa.Column('pageyield', sa.Integer),
+        sa.Column('notes', sa.Text),
+        sa.Column('createddate', sa.DateTime, nullable=False),
+        sa.Column('modifieddate', sa.DateTime, nullable=False),
+        sa.Column('isactive', sa.Boolean, nullable=False, server_default=sa.true()),
+        sa.UniqueConstraint('modelnumberid', 'partnumber', name='uq_modelsupply_part'),
+    )
+    op.create_index('idx_modelsupplies_modelnumberid', 'modelsupplies', ['modelnumberid'])
+
+
+def downgrade():
+    op.drop_index('idx_modelsupplies_modelnumberid', table_name='modelsupplies')
+    op.drop_table('modelsupplies')