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/init.py

@@ -1,8 +1,15 @@
 """# Summary
 
-Infrastructure initialization — connects MongoDB and wires all repos and services.
-Shared bootstrap for both the FastAPI app and the worker, guarded against
-repeated initialization via a module-level flag.
+Composition root — connects MongoDB (when selected), wires all repos and
+services, and returns the resources dict. Shared bootstrap for the FastAPI
+app, the worker and the seed/drop scripts, guarded against repeated
+initialization via a module-level flag.
+
+---
+
+The ``memory`` backend skips the Mongo connection entirely — repos are
+process-local dictionaries, so a plain ``uvicorn main:app`` runs with zero
+external services.
 """
 from typing import Any
 
@@ -18,18 +25,21 @@ _initialized: bool = False
 
 
 async def init() -> dict[str, Any]:
-    """Connect MongoDB, wire all repos and services, and return the resources dict.
+    """Wire all repos and services, and return the resources dict.
 
     Idempotent: repeated calls short-circuit and return the cached resources.
+    Only the ``mongo`` backend performs a network connection here.
 
     Returns:
-        Dict[str, Any]: Named services keyed by resource name.
+        Dict[str, Any]: Named services keyed by resource name
+            (``<resource>_svc`` and ``<resource>_repo``).
     """
     global _resources, _initialized
     if _initialized:
         return _resources
 
-    await setup_database(uri=settings.mongo_uri, db_name=settings.mongo_db)
+    if settings.repo_backend == "mongo":
+        await setup_database(uri=settings.mongo_uri, db_name=settings.mongo_db)
 
     item_repo = create_item_repo()
     job_repo = create_job_repo()
@@ -44,8 +54,9 @@ async def init() -> dict[str, Any]:
 
 
 async def shutdown() -> None:
-    """Disconnect MongoDB and reset the resources cache."""
+    """Disconnect MongoDB (if connected) and reset the resources cache."""
     global _initialized
-    await shutdown_database()
+    if settings.repo_backend == "mongo":
+        await shutdown_database()
     _resources.clear()
-    _initialized = False
+    _initialized = False