refactor: remove legacy models/schema/auth.py re-export file

All 84 import sites now use the canonical path
app.modules.tenancy.schemas.auth directly — no need
for backwards-compatibility re-exports.

Update audit validator to check module schemas locations
instead of only the legacy models/schema/ path.

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

models/schema/__init__.py

@@ -23,7 +23,6 @@ Import schemas from their canonical module locations instead of this package.
 
 # Infrastructure schemas that remain here
 from . import (
-    auth,
     base,
 )
 
@@ -32,5 +31,4 @@ from .base import *  # Base Pydantic models
 
 __all__ = [
     "base",
-    "auth",
 ]

models/schema/auth.py

@@ -1,34 +0,0 @@
-# models/schema/auth.py
-"""
-LEGACY LOCATION — re-exports from canonical location.
-
-All auth schemas have been moved to app/modules/tenancy/schemas/auth.py
-per MOD-019 (schemas belong in their module).
-
-This file provides backwards compatibility re-exports.
-New code should import from: app.modules.tenancy.schemas.auth
-
-Schemas use Pydantic Field and field_validator for input validation.
-"""
-
-from app.modules.tenancy.schemas.auth import (  # noqa: F401
-    LoginResponse,
-    LogoutResponse,
-    OwnedMerchantSummary,
-    PasswordResetRequestResponse,
-    PasswordResetResponse,
-    PlatformSelectResponse,
-    StoreMembershipSummary,
-    StoreUserResponse,
-    UserContext,
-    UserCreate,
-    UserDeleteResponse,
-    UserDetailResponse,
-    UserListResponse,
-    UserLogin,
-    UserResponse,
-    UserSearchItem,
-    UserSearchResponse,
-    UserStatusToggleResponse,
-    UserUpdate,
-)