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

shopdb/plugins/templates/tests/test_plugin.py.tmpl

@@ -0,0 +1,30 @@
+"""$Name plugin smoke tests.
+
+Asserts the plugin loads cleanly and satisfies the framework contract.
+Replace and extend with domain tests as you build the plugin out.
+"""
+
+from plugins.$name.plugin import ${Name}Plugin
+
+
+def test_${name}_plugin_meta_is_valid():
+    """${Name}Plugin.meta returns a PluginMeta with the expected name."""
+    plugin = ${Name}Plugin()
+    assert plugin.meta.name == '$name'
+    assert plugin.meta.api_prefix == '/api/$name'
+
+
+def test_${name}_plugin_get_blueprint_returns_blueprint():
+    """get_blueprint returns a Flask Blueprint, not None."""
+    from flask import Blueprint
+    plugin = ${Name}Plugin()
+    assert isinstance(plugin.get_blueprint(), Blueprint)
+
+
+def test_${name}_plugin_get_models_returns_a_model():
+    """get_models returns a list with at least one SQLAlchemy model."""
+    plugin = ${Name}Plugin()
+    models = plugin.get_models()
+    assert len(models) >= 1
+    for model in models:
+        assert hasattr(model, '__tablename__')