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/domain/pets/models.py

@@ -0,0 +1,37 @@
+"""# Summary
+
+Pets domain — animals owned by parents and treated in appointments.
+"""
+from typing import Literal
+
+from pydantic import BaseModel
+
+from domain.parents.models import Metadata
+
+
+class Pet(BaseModel):
+    """A pet patient.
+
+    Attributes:
+        id (int | None): Server-assigned identifier. Defaults to None.
+        name (str): Name of the pet.
+        species (str): Type of animal (dog, cat, bird).
+        age (int | None): Age in years. Defaults to None.
+        weight (float | None): Weight in kilograms. Defaults to None.
+        birthDate (str | None): ISO date of birth. Defaults to None.
+        photo (str | None): Stored photo path after upload. Defaults to None.
+        parents (list[dict]): Embedded parent objects (or bare ids on input).
+        metadata (Metadata | None): Presentation metadata. Defaults to None.
+    """
+
+    id: int | None = None
+    name: str
+    species: Literal["dog", "cat", "bird"]
+    age: int | None = None
+    weight: float | None = None
+    birthDate: str | None = None
+    photo: str | None = None
+    parents: list[dict] = []
+    metadata: Metadata | None = None
+
+    model_config = {"extra": "ignore"}