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/Dockerfile

@@ -12,9 +12,7 @@ COPY . .
 RUN pip install --no-cache-dir --upgrade pip \
  && pip install --no-cache-dir --extra-index-url "${PIP_EXTRA_INDEX_URL}" .
 
-EXPOSE 8000
+EXPOSE 8020
 
-# Two processes, per the two axes:
-#   - main.py   : the spec-first FastAPI application
-#   - worker.py : the pipeline consumer polling pending jobs
-CMD ["sh", "-c", "uvicorn main:app --host 0.0.0.0 --port 8000 & exec python worker.py"]
+# Spec-first FastAPI application (no worker by design for this service)
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8020"]