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/models/model_supply.py

@@ -0,0 +1,56 @@
+"""Model-to-supply mapping - data-driven toner/drum/waste part numbers.
+
+Replaces the old hardcoded part-number table. Each row maps one printer
+model to one supply part (a toner of a given color and capacity tier, or a
+drum/waste/maintenance item). Lets new models and their toners be added
+through the API/UI without a code change.
+"""
+
+from shopdb.api import db, BaseModel
+
+
+# allowed values, surfaced to the UI via the /supplies/meta endpoint
+SUPPLY_TYPES = ('toner', 'drum', 'waste', 'maintenance')
+SUPPLY_COLORS = ('black', 'cyan', 'magenta', 'yellow', 'none')
+CAPACITY_TIERS = ('standard', 'high', 'extrahigh', 'metered', 'dmo')
+
+
+class ModelSupply(BaseModel):
+    """One supply part belonging to one printer model."""
+    __tablename__ = 'modelsupplies'
+
+    modelsupplyid = db.Column(db.Integer, primary_key=True)
+
+    modelnumberid = db.Column(
+        db.Integer,
+        db.ForeignKey('models.modelnumberid'),
+        nullable=False,
+    )
+
+    # toner, drum, waste, maintenance
+    supplytype = db.Column(db.String(20), nullable=False, default='toner')
+    # black, cyan, magenta, yellow, or none (drum/waste have no color)
+    color = db.Column(db.String(20), nullable=False, default='none')
+    # standard, high, extrahigh, metered, dmo
+    capacitytier = db.Column(db.String(20), nullable=False, default='standard')
+
+    partnumber = db.Column(db.String(50), nullable=False)
+    marketingname = db.Column(db.String(120))
+    pageyield = db.Column(db.Integer, comment='Rated page yield at 5 percent coverage')
+    notes = db.Column(db.Text)
+
+    model = db.relationship('Model', backref='supplies')
+
+    # one part number per model, no duplicates
+    __table_args__ = (
+        db.UniqueConstraint('modelnumberid', 'partnumber', name='uq_modelsupply_part'),
+    )
+
+    def __repr__(self):
+        return f"<ModelSupply {self.partnumber} ({self.color}/{self.capacitytier})>"
+
+    def to_dict(self):
+        data = super().to_dict()
+        if self.model:
+            data['modelnumber'] = self.model.modelnumber
+        return data