printedparts stage 1: scaffold, no AssetType, manifest per spec

flask plugin new output, minus the scaffold's AssetType seeding:
printed parts are quantity-based consumables, not ADR-001 assets.
on_install seeds the three plugin settings instead. Manifest pins
core >=0.11.0, depends on employees (badge name resolution), ships
disabled until a site opts in.

plugins/printedparts/manifest.json

@@ -0,0 +1,11 @@
+{
+    "name": "printedparts",
+    "version": "0.1.0",
+    "description": "3D-printed parts inventory + kiosk checkout",
+    "display_name": "3D Printed Parts",
+    "author": "",
+    "dependencies": ["employees"],
+    "core_version": ">=0.11.0,<1.0.0",
+    "api_prefix": "/api/printedparts",
+    "default_enabled": false
+}