Add seed data schemas folder with common seed types

- Create /schemas/seed/ folder structure for seed data schemas
- Add page-config schema for PageConfig seed data
- Add component-config schema for ComponentConfig seed data
- Add workflow schema for Workflow seed data
- Add permission schema for permission seed data
- Update ui_home to reference schema location

packages/ui_home/seed/page-config.json

@@ -1,5 +1,6 @@
 [
   {
+    "$schema": "https://metabuilder.dev/schemas/seed/page-config/schema.json",
     "id": "page_ui_home_root",
     "path": "/",
     "title": "MetaBuilder",