feat: renumber lib reference into 4-pillar anatomy

Renumber the 15 reference docs into pillar groups (recipe -> anatomy):
- 01 Build Recipe (entry), 02 Composition Root
- domains: 10 Layering Rules
- contract: 20 Spec-First Routing, 21 CRUD Template, 22 Auth Integration
- interfaces/infra: 30 Infra Adapters
- UI: 40 UI: Auto-Rendered Admin & Custom Pages (new; @aetoskia packages,
  client template, x- catalog via react-openapi MCP module)
- pipelines: 50 Pipeline Scaffold, 51 Worker & Progress, 52 Human-in-the-Loop
- delivery/meta: 90 Drone Pipelines, 91 Versioning & Changelog,
  92 Genericity Matrix, 93 Library Registry, 94 Repository Inventory

MCP module names are unchanged (NN_ prefix stripped); all cross-references
(wiki, templates, hooks, registry) updated; lib index rewritten pillar-first;
build recipe bootstraps the client template. Bundle + HTML sites regenerated.

standards/mcp/templates/app/domain/item/models.py

@@ -9,11 +9,13 @@ class Item(BaseModel):
     """A single countable resource.
 
     Attributes:
+        id (int | None): Server-assigned identifier. Defaults to None.
         name (str): Item name.
         quantity (int): Item quantity. Defaults to 1.
     """
 
+    id: int | None = None
     name: str
     quantity: int = Field(default=1)
 
-    model_config = {"extra": "ignore"}
+    model_config = {"extra": "ignore"}