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>

migrations/versions/7c03_locationtypes.py

@@ -0,0 +1,56 @@
+"""Add locationtypes + locations tree (ADR-001)
+
+Creates the locationtypes lookup and extends locations with locationtypeid +
+parentlocationid (self-FK), so sites can classify locations and build a
+location tree (sections, cells, sub-cells, operations, etc.). Seeds the
+canonical location types.
+
+Revision ID: 7c03_locationtypes
+Revises: 7c02_app_isrequired
+Create Date: 2026-06-26
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+revision = '7c03_locationtypes'
+down_revision = '7c02_app_isrequired'
+branch_labels = None
+depends_on = None
+
+_TYPES = ['section', 'cell', 'subcell', 'operation', 'meetingroom', 'lab',
+          'office', 'storage', 'hallway', 'networkcloset', 'building']
+
+
+def upgrade():
+    op.create_table(
+        'locationtypes',
+        sa.Column('locationtypeid', sa.Integer(), primary_key=True),
+        sa.Column('locationtype', sa.String(length=50), nullable=False, unique=True),
+        sa.Column('description', sa.Text(), nullable=True),
+        sa.Column('createddate', sa.DateTime(), nullable=True),
+        sa.Column('modifieddate', sa.DateTime(), nullable=True),
+        sa.Column('isactive', sa.Boolean(), nullable=True),
+    )
+    with op.batch_alter_table('locations') as batch_op:
+        batch_op.add_column(sa.Column('locationtypeid', sa.Integer(), nullable=True))
+        batch_op.add_column(sa.Column('parentlocationid', sa.Integer(), nullable=True))
+        batch_op.create_foreign_key('fk_locations_locationtype', 'locationtypes',
+                                    ['locationtypeid'], ['locationtypeid'])
+        batch_op.create_foreign_key('fk_locations_parent', 'locations',
+                                    ['parentlocationid'], ['locationid'])
+
+    lt = sa.table('locationtypes',
+                  sa.column('locationtype', sa.String),
+                  sa.column('isactive', sa.Boolean))
+    op.bulk_insert(lt, [{'locationtype': t, 'isactive': True} for t in _TYPES])
+
+
+def downgrade():
+    with op.batch_alter_table('locations') as batch_op:
+        batch_op.drop_constraint('fk_locations_parent', type_='foreignkey')
+        batch_op.drop_constraint('fk_locations_locationtype', type_='foreignkey')
+        batch_op.drop_column('parentlocationid')
+        batch_op.drop_column('locationtypeid')
+    op.drop_table('locationtypes')