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/api/__init__.py.tmpl

@@ -0,0 +1,5 @@
+"""$Name plugin API package."""
+
+from .routes import ${name}_bp
+
+__all__ = ['${name}_bp']

shopdb/plugins/templates/api/routes.py.tmpl

@@ -0,0 +1,45 @@
+"""$Name plugin API routes."""
+
+from flask import Blueprint, request
+from flask_jwt_extended import jwt_required
+
+from shopdb.api import (
+    success_response,
+    error_response,
+    paginated_response,
+    ErrorCodes,
+    get_pagination_params,
+    paginate_query,
+)
+
+from ..models import $Name
+
+
+${name}_bp = Blueprint('$name', __name__)
+
+
+@${name}_bp.route('', methods=['GET'])
+@jwt_required(optional=True)
+def list_${name}():
+    """List $name assets, paginated."""
+    page, per_page = get_pagination_params(request)
+
+    query = ${Name}.query
+    items, total = paginate_query(query, page, per_page)
+    data = [item.to_dict() for item in items]
+
+    return paginated_response(data, page, per_page, total)
+
+
+@${name}_bp.route('/<int:assetid>', methods=['GET'])
+@jwt_required(optional=True)
+def get_${name}(assetid: int):
+    """Get a single $name by assetid."""
+    item = ${Name}.query.get(assetid)
+    if not item:
+        return error_response(
+            ErrorCodes.NOT_FOUND,
+            f'$Name with assetid {assetid} not found',
+            http_code=404,
+        )
+    return success_response(item.to_dict())