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

config.yml

@@ -151,15 +151,6 @@ repos:
       lib: site
       api: site
 
-  - name: vet
-    source: ../react/vet
-    title: Vet
-    description: Full-stack reference application — OpenAPI-first FastAPI server paired with the spec-driven React admin client (@aetoskia/react-openapi + @aetoskia/react-auth).
-    section: apps
-    docs:
-      lib: site
-      mcp: { bundle: docs/mcp, server: vet, port: 8013 }
-
 static:
   - kind: wiki
     repo: standards