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

migrations/versions/7d15_warranties.py

@@ -0,0 +1,45 @@
+"""Warranty plugin: warranties + warrantyassets
+
+Revision ID: 7d15_warranties
+Revises: 7d14_customfields
+Create Date: 2026-07-09
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+revision = '7d15_warranties'
+down_revision = '7d14_customfields'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.create_table(
+        'warranties',
+        sa.Column('warrantyid', sa.Integer(), primary_key=True),
+        sa.Column('vendor', sa.String(length=100), nullable=False),
+        sa.Column('servicetag', sa.String(length=100), nullable=True),
+        sa.Column('provider', sa.String(length=20), nullable=False, server_default='manual'),
+        sa.Column('servicelevel', sa.String(length=150), nullable=True),
+        sa.Column('startdate', sa.Date(), nullable=True),
+        sa.Column('enddate', sa.Date(), nullable=True),
+        sa.Column('lastcheckeddate', sa.DateTime(), nullable=True),
+        sa.Column('notes', sa.Text(), nullable=True),
+        sa.Column('isactive', sa.Boolean(), nullable=False, server_default='1'),
+    )
+    op.create_table(
+        'warrantyassets',
+        sa.Column('id', sa.Integer(), primary_key=True),
+        sa.Column('warrantyid', sa.Integer(), nullable=False),
+        sa.Column('assetid', sa.Integer(), nullable=False),
+        sa.ForeignKeyConstraint(['warrantyid'], ['warranties.warrantyid'], ondelete='CASCADE'),
+        sa.ForeignKeyConstraint(['assetid'], ['assets.assetid'], ondelete='CASCADE'),
+        sa.UniqueConstraint('warrantyid', 'assetid', name='uq_warrantyasset_warranty_asset'),
+    )
+
+
+def downgrade():
+    op.drop_table('warrantyassets')
+    op.drop_table('warranties')