Add locationtypes + location tree (ADR-001)

- New locationtypes lookup (LocationType model) seeded with section, cell,
  subcell, operation, meetingroom, lab, office, storage, hallway,
  networkcloset, building.
- locations gains locationtypeid + parentlocationid (self-FK) for the site
  location tree. Migration 7c03; cli reference-data seeds the types.
- GET /api/locations/types; locations CRUD accepts type + parent; list/detail
  return locationtypename + parentlocationname.
- Locations settings page: Type column + Type/Parent selectors in the modal.

Realizes the operation-as-Location model (operations are locations with
locationtypeid='operation').

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

shopdb/core/models/location.py

@@ -1,9 +1,25 @@
-"""Location model."""
+"""Location + LocationType models."""
 
 from shopdb.extensions import db
 from .base import BaseModel
 
 
+class LocationType(BaseModel):
+    """Location classification (ADR-001 shared reference data).
+
+    Seeded values: section, cell, subcell, operation, meetingroom, lab,
+    office, storage, hallway, networkcloset, building. Sites can extend.
+    """
+    __tablename__ = 'locationtypes'
+
+    locationtypeid = db.Column(db.Integer, primary_key=True)
+    locationtype = db.Column(db.String(50), unique=True, nullable=False)
+    description = db.Column(db.Text)
+
+    def __repr__(self):
+        return f"<LocationType {self.locationtype}>"
+
+
 class Location(BaseModel):
     """Physical location model."""
     __tablename__ = 'locations'
@@ -15,6 +31,19 @@ class Location(BaseModel):
     room = db.Column(db.String(50))
     description = db.Column(db.Text)
 
+    # Classification + tree (ADR-001)
+    locationtypeid = db.Column(
+        db.Integer,
+        db.ForeignKey('locationtypes.locationtypeid'),
+        nullable=True
+    )
+    parentlocationid = db.Column(
+        db.Integer,
+        db.ForeignKey('locations.locationid'),
+        nullable=True,
+        comment='Parent location for the site location tree'
+    )
+
     # Map configuration
     mapimage = db.Column(db.String(500), comment='Path to floor map image')
     mapwidth = db.Column(db.Integer)
@@ -26,5 +55,15 @@ class Location(BaseModel):
     mapx = db.Column(db.Integer, comment='Default X coordinate for assets at this location')
     mapy = db.Column(db.Integer, comment='Default Y coordinate for assets at this location')
 
+    # Relationships
+    locationtype = db.relationship('LocationType')
+    parent = db.relationship('Location', remote_side=[locationid])
+
+    def to_dict(self):
+        data = super().to_dict()
+        data['locationtypename'] = self.locationtype.locationtype if self.locationtype else None
+        data['parentlocationname'] = self.parent.locationname if self.parent else None
+        return data
+
     def __repr__(self):
         return f"<Location {self.locationname}>"