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/7d08_tvslides.py

@@ -0,0 +1,36 @@
+"""Slide manager: tvslides table
+
+Backing table for the slides plugin (lobby display + shopfloor screensaver
+playlists). Image files live on disk; this holds order + per-slide duration.
+
+Revision ID: 7d08_tvslides
+Revises: 7d07_assettype_color
+Create Date: 2026-07-08
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+revision = '7d08_tvslides'
+down_revision = '7d07_assettype_color'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.create_table(
+        'tvslides',
+        sa.Column('slideid', sa.Integer(), primary_key=True),
+        sa.Column('surface', sa.String(length=20), nullable=False),
+        sa.Column('filename', sa.String(length=255), nullable=False),
+        sa.Column('sortorder', sa.Integer(), nullable=False, server_default='0'),
+        sa.Column('seconds', sa.Integer(), nullable=False, server_default='0'),
+        sa.Column('uploadeddate', sa.DateTime(), nullable=True),
+    )
+    op.create_index('idx_tvslide_surface', 'tvslides', ['surface'])
+
+
+def downgrade():
+    op.drop_index('idx_tvslide_surface', table_name='tvslides')
+    op.drop_table('tvslides')