Initial import: shopdb-flask multi-site asset platform

Flask + Vue rewrite of the classic-ASP shopdb, built as a plugin
framework so sister GE Aerospace sites can adopt it. Product version
0.7.0-pre-0.8.0, plugin contract 0.11.0, 966 backend tests.

Key entry points:
- docs/INSTALL-WINDOWS-IIS.md - tested Windows + IIS install runbook
  (own-site and subpath deployment methods)
- docs/PILOT-DEPLOY.md - production pilot: stand up + import + verify
- docs/IMPORT-API.md - schema-agnostic legacy data import contract
- scripts/site_imports/wjf/ - West Jefferson reference import loader
- docs/adr/ - twelve accepted architecture decision records

plugins/printers/services/__init__.py

@@ -0,0 +1,19 @@
+"""Printers plugin services."""
+
+from .zabbix_service import ZabbixService
+from .supply_parts import (
+    classifysupply,
+    derivesupplytype,
+    derivecolor,
+    lookupsupplies,
+)
+from .seed_supplies import seedsupplies
+
+__all__ = [
+    'ZabbixService',
+    'classifysupply',
+    'derivesupplytype',
+    'derivecolor',
+    'lookupsupplies',
+    'seedsupplies',
+]