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/.env.example

@@ -1,9 +1,9 @@
 DEBUG=false
 REPO_BACKEND=memory
 MONGO_URI=mongodb://localhost:27017
-MONGO_DB=app_template
-PORT=8000
-WORKER_POLL_SECONDS=30
-WORKER_MAX_RETRIES=3
-AUTH_SERVER=http://localhost:8000
-JWT_SERVER=http://localhost:8000
+MONGO_DB=vet
+UPLOADS_DIR=uploads
+PORT=8020
+AUTH_SERVER=https://auth.aetoskia.com
+WORKER_POLL_SECONDS=5
+WORKER_MAX_RETRIES=3