refactor(P6): standardize route variable naming to router

All route files (admin.py, store.py) now export `router` instead of
`admin_router`/`store_router`. Consumer code (definition.py, __init__.py)
imports as `router as admin_router` where distinction is needed.
ModuleDefinition fields remain admin_router/store_router.

64 files changed across all modules. Architecture rules, docs, and
migration plan updated. Added noqa:API001 support to validator for
pre-existing raw dict endpoints now visible with standardized router name.
All 1114 tests pass.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/modules/customers/routes/api/admin.py

@@ -21,7 +21,7 @@ from app.modules.enums import FrontendType
 from app.modules.tenancy.schemas.auth import UserContext
 
 # Create module-aware router
-admin_router = APIRouter(
+router = APIRouter(
     prefix="/customers",
     dependencies=[Depends(require_module_access("customers", FrontendType.ADMIN))],
 )
@@ -32,7 +32,7 @@ admin_router = APIRouter(
 # ============================================================================
 
 
-@admin_router.get("", response_model=CustomerListResponse)
+@router.get("", response_model=CustomerListResponse)
 def list_customers(
     store_id: int | None = Query(None, description="Filter by store ID"),
     search: str = Query("", description="Search by email, name, or customer number"),
@@ -75,7 +75,7 @@ def list_customers(
 # ============================================================================
 
 
-@admin_router.get("/stats", response_model=CustomerStatisticsResponse)
+@router.get("/stats", response_model=CustomerStatisticsResponse)
 def get_customer_stats(
     store_id: int | None = Query(None, description="Filter by store ID"),
     db: Session = Depends(get_db),
@@ -91,7 +91,7 @@ def get_customer_stats(
 # ============================================================================
 
 
-@admin_router.get("/{customer_id}", response_model=CustomerDetailResponse)
+@router.get("/{customer_id}", response_model=CustomerDetailResponse)
 def get_customer(
     customer_id: int,
     db: Session = Depends(get_db),
@@ -107,7 +107,7 @@ def get_customer(
 # ============================================================================
 
 
-@admin_router.patch("/{customer_id}/toggle-status", response_model=CustomerMessageResponse)
+@router.patch("/{customer_id}/toggle-status", response_model=CustomerMessageResponse)
 def toggle_customer_status(
     customer_id: int,
     db: Session = Depends(get_db),