Phase 7: serve the vet sample from the template tools and docs

- build.py: _TEMPLATE_COMPONENTS rewritten around the vet sample (53 kinds —
  per-resource slices, jobs, worked appointment_reminder family, tests);
  seed tokens dropped from the manifest ('sample: vet' instead)
- registry.py: get_app_component(kind) no longer renames item/example seeds;
  prompts and tool docs updated to 'copy a slice and adapt'
- templates/README.md, 01_build_recipe, 40_ui_admin, wiki/03 updated off the
  old seed scheme; repo inventory/config now exclude vet (docs move under
  standards; react/vet itself is deleted in a later phase)
- regenerated MCP bundle, vendored templates, and site output

standards/mcp/templates/app/scripts/seed.py

@@ -12,12 +12,19 @@ from init import init, shutdown
 
 
 async def main() -> None:
-    """Seed one demo item and shut down cleanly."""
+    """Seed minimal demo records and shut down cleanly."""
     resources = await init()
     try:
-        item_svc = resources["item_svc"]
-        await item_svc.create({"name": "seed", "quantity": 1})
-        print("Seeded one item.")
+        await resources["parent_svc"].create(
+            {"name": "Alice Parker", "email": "alice@vet.example"}
+        )
+        await resources["vet_svc"].create(
+            {"name": "Dr. Chen", "specialty": "Canine", "email": "chen@vet.example"}
+        )
+        await resources["treatment_svc"].create(
+            {"label": "Checkup", "description": "Routine wellness exam"}
+        )
+        print("Seeded demo parents/vets/treatments.")
     finally:
         await shutdown()