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/main.py

@@ -52,7 +52,7 @@ async def lifespan(app: OpenAPIFirstApp):
 app = OpenAPIFirstApp(
     openapi_path="openapi.yaml",
     routes_module=openapi_routes,
-    title="App Template API",
+    title="Veterinary Clinic API",
     version="0.1.0",
     lifespan=lifespan,
 )