printedparts stage 2: models, real 0001 baseline, tables live

PrintedItem (catalog: code, name, image, cached quantityonhand,
per-item threshold, bin) and PrintedItemTransaction (the ledger:
signed quantity change attributed to a badge-resolved employee).
Both registered in PLUGIN_TABLE_OWNERS; 0001 is a post-cutover real
baseline. The migration-guard test learns the new expected head.
Routes are a placeholder ping until the next stage - the scaffold's
list route imported the deleted scaffold model, which surfaces as an
empty 'Migration error' because the alembic env imports the models
package.

plugins/printedparts/api/routes.py

@@ -1,45 +1,18 @@
-"""Printedparts plugin API routes."""
+"""Printedparts plugin API routes.
 
-from flask import Blueprint, request
-from flask_jwt_extended import jwt_required
+Stage 2 placeholder: the blueprint must import cleanly for plugin discovery
+and migrations (the alembic env imports the models package, which pulls in
+plugin.py and this module). Real endpoints land in the next stage.
+"""
 
-from shopdb.api import (
-    success_response,
-    error_response,
-    paginated_response,
-    ErrorCodes,
-    get_pagination_params,
-    paginate_query,
-)
-
-from ..models import Printedparts
+from flask import Blueprint
 
+from shopdb.api import success_response
 
 printedparts_bp = Blueprint('printedparts', __name__)
 
 
-@printedparts_bp.route('', methods=['GET'])
-@jwt_required(optional=True)
-def list_printedparts():
-    """List printedparts assets, paginated."""
-    page, per_page = get_pagination_params(request)
-
-    query = Printedparts.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)
-
-
-@printedparts_bp.route('/<int:assetid>', methods=['GET'])
-@jwt_required(optional=True)
-def get_printedparts(assetid: int):
-    """Get a single printedparts by assetid."""
-    item = Printedparts.query.get(assetid)
-    if not item:
-        return error_response(
-            ErrorCodes.NOT_FOUND,
-            f'Printedparts with assetid {assetid} not found',
-            http_code=404,
-        )
-    return success_response(item.to_dict())
+@printedparts_bp.route('/ping', methods=['GET'])
+def ping():
+    """Liveness probe for the lab: proves the blueprint is registered."""
+    return success_response({'plugin': 'printedparts', 'status': 'ok'})